Only 2 is correct.
The Palaeolithic period extends from 2 million years ago to about 12,000 years ago. This long stretch of time is divided into the Lower, Middle and Upper Palaeolithic. This long span of time covers 99% of human history.
Stone tools found during this period are generally tiny, and are called microliths. Ostriches were found in India during the Palaeolithic period. Large quantities of ostrich egg shells were found at Patne in Maharashtra. Designs were engraved on some pieces, while beads were also made out of them.

Located in Kacchi plains of Baluchistan, Mehrgarh provides the earliest evidence of settled agriculture in the subcontinent and probably south Asia. It is considered a precursor to Indus Valley Civilization

All of the above are correct.
Many crafts persons and merchants formed associations known as shrenis.
These shrenis of crafts persons provided training, procured raw material, and distributed the finished product.
Then shrenis of merchants organised the trade. Shrenis also served as banks, where rich men and women deposited money.
This was invested, and part of the interest was returned or used to support religious institutions such as monasteries

2 and 4 are correct.
Gandhi-Irwin Pact placed the Congress on an equal footing with the government.
Irwin on behalf of the government agreed on—
1. immediate release of all political prisoners not convicted of violence;
2. remission of all fines not yet collected;
3. return of all lands not yet sold to third parties;
4. lenient treatment to those government servants who had resigned;
5. right to make salt in coastal villages for personal consumption (not for sale);
6. right to peaceful and non-aggressive picketing; and
7. withdrawal of emergency ordinances.
The viceroy, however, turned down two of Gandhi’s demands—
(i) public inquiry into police excesses, and
(ii) commutation of Bhagat Singh and his comrades’ death sentence to life sentence.
Gandhi on behalf of the Congress agreed—
(i) to suspend the civil disobedience movement, and
(ii) to participate in the next Round Table Conference

Option a is correct.
In 1923, the first May day was celebrated in India in Madras.
1928 – Nehru Report
Dandi March – March 12-April 6, 1930
First Round Table Conference – November 1930 – January 1931