Explanation:

• The Instrument of Accession was a legal document first introduced by the Government of India Act 1935 and used in 1947 to enable each of the rulers of the princely states under British paramountcy to join one of the new dominions of India or Pakistan created by the Partition of British India.
• After a brief struggle between India and Pakistan, Junagadh joined India on 9 November 1947. It was a part of Saurashtra state and later Bombay state. In 1960, in consequence of the Maha Gujarat movement, it became part of the newly formed Gujarat state. Hence option 4th is correct.