Explanation:

Communal violence in Bengal and Punjab in January and March 1947 further convinced Patel of the soundness of partition. ... When Lord Mountbatten formally proposed the plan on 3 June 1947, Patel gave his approval and lobbied Nehru and other Congress leaders to accept the proposal.
“Partition” – the division of British India into the two separate states of India and Pakistan on August 14-15, 1947 – was the “last-minute” ... An act of parliament proposed June 1948 as the deadline for the transfer of power. ... provinces of the Punjab and Bengal in two, were officially approved on August 17. Hence statement 4th is correct.