The correct option is B August Offer
The demand of Constituent Assembly starting to be raised by Indians and in 1935-1936 this demand was officially raised before British Government by the Indian National Congress. Consequently, the demand was accepted by the British Government which sought the support of Indians in the War. The British Government proposed "August Offer" in 1940 accepting the demand conditionally and promising the formation of "Constitution-making body" after the war. The offer, however, was rejected by the Congress.