Option A — Bhimrao Ambedkar and Mahatma Gandhi
The Poona Pact (1932) was signed between B.R. Ambedkar and Mahatma Gandhi, dropping separate electorates for Dalits in favour of reserved seats in general electorates.
The examiner expects you to recall that Gandhi went on a fast-unto-death opposing the Communal Award's separate electorates for Depressed Classes, leading Ambedkar to negotiate the Poona Pact with him. Options C and D refer to different agreements (Gandhi-Irwin Pact 1931; Gandhi-Jinnah talks), so eliminate them quickly.