The correct option is D 3 June 1947
Lord Mountbatten put his plan for the partition of India before the big seven leaders- Nehru, Patel, Kripalani, Jinnah, Liaquat, Nishtar and Baldev Singh. The Congress accepted the plan and Jinnah undertook to do his utmost to make the plan work. The plan was announced on June 3, 1947.