The correct answer is: B. Hari Singh.
Hari Singh was the last Maharaja of Jammu and Kashmir. He signed the Instrument of Accession on October 26, 1947, making Jammu and Kashmir an independent dominion within the Indian Union.
Partap Singh was the Maharaja of Jammu and Kashmir from 1819 to 1857. He was succeeded by his son, Gulab Singh.
Gulab Singh was the Maharaja of Jammu and Kashmir from 1846 to 1857. He was the founder of the Dogra dynasty.
Karan Singh was the son of Hari Singh and the last Sadr-i-Riyasat (head of state) of Jammu and Kashmir from 1952 to 1965. He was also the first Governor of Jammu and Kashmir from 1965 to 1972.
The Instrument of Accession was an agreement between the Maharaja of Jammu and Kashmir and the Government of India. It was signed on October 26, 1947, and made Jammu and Kashmir an independent dominion within the Indian Union. The Instrument of Accession was a controversial document, and its validity has been challenged by Pakistan. However, the Instrument of Accession is the legal basis for India’s claim to Jammu and Kashmir.