Explanation:

- Option 1: Mohammad Shafi

- He was a prominent politician from Punjab, but not known for introducing a bill for compulsory and free primary education.

- Option 2: Feroz Shah Mehta

- A noted leader and president of the Indian National Congress. Known more for his work in municipal governance and reform.

- Option 3: G.K. Gokhale

- He was a respected leader in the Indian freedom struggle and a member of the Imperial Legislative Council.

- Gokhale introduced a bill for compulsory and free primary education in 1911.

- His efforts were aimed at eradicating illiteracy and promoting education for all children.

- Option 4: Shankaran Nair

- He was an Indian politician and lawyer. Served on the Viceroy’s Executive Council but didn't introduce this specific bill.