Explanation:

- The correct answer is: Option 1: February, 1947

- In February 1947, Clement Attlee, the British Prime Minister, announced that British rule in India would end, and power would be transferred to Indian hands by June 1948.

- The date of actual independence was brought forward: India achieved independence on 15th August 1947.

- Option 2: June, 1949 is incorrect, as India had already gained independence by then.

- Option 3: August, 1947 is when independence happened, not when Attlee made the announcement.

- Option 4: June, 1948 is not correct, though that was the proposed latest date for transfer, not the date of Attlee’s announcement.