The correct answer is option 1 - 1946. The Cabinet Mission came to India in the year 1946. The mission was a group of three British cabinet ministers sent to India to discuss and propose plans for India`s future governance. The purpose of the mission was to find a solution to the increasing demand for Indian independence. The mission proposed a plan for a united India with a federal structure, where power would be shared between the central government and provinces. However, this plan was not accepted by the Indian National Congress and the Muslim League, leading to further negotiations and ultimately the partition of India in 1947. Therefore, option 1 - 1946 is the correct answer.