https://www.livelaw.in/news-updates/judge-k-s-radhakrishnan-appointed-member-of-commonwealth-secretariat-arbitral-tribunal-144893
The Commonwealth Secretariat Arbitral Tribunal resolves disputes of the Commonwealth organisations, international or intergovernmental.
It is based in London.
It functions under a Statute agreed by Commonwealth governments.
Composition: eight members, comprising the President and 7 Members. Members are selected by the Commonwealth Governments.
Eligibility: For the post of Member, a person shall be of high moral character who has held or holds high judicial office in a Commonwealth country. Even a legal consultant with at least 10 years of experience is eligible for the post.
Term: The Members are appointed for a 4-year term. Their term can be renewed, however, only once.

Functions:
It hears applications brought by staff of the Commonwealth Secretariat, Commonwealth Secretariat or any person who is in contract with the Commonwealth Secretariat.
The Tribunal entertains only such cases in which organisations agree to surrender to its jurisdiction.

https://www.thehindu.com/news/national/sc-collegium-recommends-justices-gavai-surya-kants-names-for-elevation/article27076939.ece

The Collegium System is a system under which appointments/elevation of judges/lawyers to Supreme Court and transfers of judges of High Courts and Apex Court are decided by a forum of the Chief Justice of India and the four senior-most judges of the Supreme Court.’ There is no mention of the Collegium either in the original Constitution of India or in successive amendments.
The recommendations of the Collegium are binding on the Central Government; if the Collegium sends the names of the judges/lawyers to the government for the second time.
Appointments and promotion of district judges in any state shall be made by the Governor of the state in consultation with the high court exercising jurisdiction in relation to such state. Hence statement is wrong and using TIKDAM, you can get option b which is correct.

http://whc.unesco.org/en/news/1969
In order to protect the migratory species throughout their range countries, a Convention on Conservation of Migratory Species (CMS), has been in force, under the aegis of United Nations Environment Programme.
It is also referred to as the Bonn Convention, and it provides a global platform for the conservation and sustainable use of migratory animals and their habitats and brings together the States through which migratory animals pass, the Range States, and lays the legal foundation for internationally coordinated conservation measures throughout a migratory range.
Under this convention, migratory species threatened with extinction are listed on Appendix I and Parties strive towards strictly protecting these animals, conserving or restoring the places where they live, mitigating obstacles to migration and controlling other factors that might endanger them.
Migratory species that need or would significantly benefit from international co-operation are listed in Appendix II of the Convention.
CMS is the only global and UN-based intergovernmental organization established exclusively for conservation and management of terrestrial, aquatic and avian migratory species throughout their range.

https://www.thehindu.com/news/national/other-states/cyclone-fanis-fury-creates-four-new-mouths-in-odishas-chilika-lake/article27097604.ece

The extremely severe cyclone, Fani, has created four new mouths in Chilika Lake.
Chilika lagoon had only two active mouths. Four new mouths have opened due to wave energy with high tidal prism.
Chilika lake is the largest coastal lagoon in India and the second largest lagoon in the world after the New Caledonian barrier reef in New Caledonia.
It is the largest wintering ground for migratory waterfowl found anywhere on the Indian sub-continent.
It is one of the hotspot of biodiversity in the country, and some rare, vulnerable and endangered species listed in the IUCN Red List of threatened Animals inhabit in the lagoon for at least part of their life cycle.
On account of its rich biodiversity and ecological significance, Chilika was designated as the 1st “Ramsar Site” of India.
The Nalaban Island within the lagoon is notified as a Bird Sanctuary under Wildlife (Protection) Act, the National Wetlands, mangroves and coral reefs Committee of Ministry of Environment & Forests, Government of India, have also identified the lagoon as a priority site for conservation and management.

UPSC 2011 Prelims Question
District planning committee has been provided by Article 243 ZD under Constitution of India, which was inserted by 74th Constitution Amendment Act and not by 73rd amendment act. So first tricky statement was incorrect. By eliminating the 1st statement, you can get the correct answer which is c. The statement 2 and 3 are correct.