A strait is a naturally formed narrow waterway that connects two large bodies of water. A strait can be formed by tectonic shifts or land that has been subsided or been eroded.

Example- The Strait of Gibraltar, the link between the Mediterranean Sea and the Atlantic Ocean was formed by tectonic shift. The Bosporus, which connects the Aegean Sea and the Black Sea, is believed to be formed by land that has subsided or eroded.

Statement 1 is incorrect
The distance between two latitudes remains the same everywhere.

Tikdam:
Statement 1 and statement 2 cannot be true simultaneously.
Statement 1 says that Bugyals are summer grasslands. This implies that Bhotias must be
migrating to these grasslands in summers and not winters. SO if you use a little bit of logic then you can remove the statement 2.

• Their average elevation is about 1,500 m with the height increasing from north to south. Hence, statement 2 is correct.
• Most of the Peninsular rivers have their origin in the Western Ghats.
• Eastern Ghats comprising the discontinuous and low hills are
highly eroded by the rivers such as the Mahanadi, the Godavari, the Krishna, the Kaveri, etc. Some of the important ranges include the Javadi hills, the Palconda range, the Nallamala hills, the Mahendragiri hills, etc.
• The Eastern and the Western Ghats meet each other at the
Nilgiri hills. Hence, statement 3 is also incorrect.

Tikdam:
Just knowing that Western Ghats are more continuous than Eastern Ghats,  which is very obvious, would have helped you eliminating option 1 and arrive  at correct answer as statement 1 is given in all options except option B.