When did the Muslim League accept Cabinet Mission's constitutional scheme?

16 June 1946

The correct answer is Option (4) → 16 June 1946

Timeline of some important events in the 1940s:

1942: Cripps Proposal
16 May 1946: Cabinet Mission announces its constitutional scheme
16 June 1946: Muslim League accepts Cabinet Mission’s constitutional scheme
16 June 1946: Cabinet Mission presents a scheme for the formation of an Interim Government at the Centre.