Correct Option: B

The Instrument of Accession was a legal document created in 1947 to enable each of the rulers of the princely states under British suzerainty to join one of the new dominions of India or Pakistan created by the Partition of British India. When United Kingdom accepted demands for a partition and announced its intention to quit India, the king of Travancore, Chithira Thirunal, issued a declaration of independence on June 18, 1947. The declaration was unacceptable to the Government of India; many rounds of negotiation were conducted among the Diwan, C. P. Ramaswami Iyer, and the Indian representatives. In July 23, 1947 they decided in favour of the accession to the Indian Union, pending approval by the king. An assassination attempt on the Diwan by the Communists on the July 25, 1947 caused to hasten the accession of Travancore state to the Indian Union