The correct answer is: A. Maharaja Gulab Singh
The Raghunath Ji temple is a Hindu temple dedicated to Lord Rama, located in Jammu, India. It is one of the most important temples in the state of Jammu and Kashmir. The temple was built by Maharaja Gulab Singh, the founder of the Dogra dynasty, in the 19th century.
Dhruv Dev was a Hindu king who ruled over the area that is now Jammu and Kashmir in the 10th century. He is said to have built a temple to Lord Rama on the site of the present-day Raghunath Ji temple. However, there is no historical evidence to support this claim.
Maharaja Ranjit Singh was a Sikh ruler who ruled over the Punjab region in the 19th century. He is said to have visited the Raghunath Ji temple on several occasions and made generous donations to the temple. However, he did not build the temple.
Therefore, the correct answer is: A. Maharaja Gulab Singh