Which was the first princely state to accede Pakistan?

A. Swat
B. Umerkot
C. Bahawalpur
D. None of these

On 5 October 1947 the Nawab signed an agreement with the government of Pakistan according to which Bahawalpur State acceded to Pakistan, and the accession was accepted on 9 October. Thus the State of Bahawalpur was the first state to accede to Pakistan.