The answer is: D. Sarnath
Plassey, Haldighati, and Panipat are all historical battlefields in India. Kurukshetra is a place mentioned in the Hindu epic Mahabharata, where the Kurukshetra War took place. Sarnath is a Buddhist pilgrimage site where Gautama Buddha gave his first sermon after attaining enlightenment.
Plassey was the site of the Battle of Plassey in 1757, in which the British East India Company defeated the Nawab of Bengal. Haldighati was the site of the Battle of Haldighati in 1576, in which the Mughal emperor Akbar defeated the Rajput ruler Rana Pratap. Panipat was the site of three battles: the First Battle of Panipat in 1526, the Second Battle of Panipat in 1556, and the Third Battle of Panipat in 1761. The Kurukshetra War was a battle between the Pandavas and the Kauravas, two branches of the Kuru clan.
Sarnath is located in the Indian state of Uttar Pradesh, about 10 kilometers from Varanasi. It is a major Buddhist pilgrimage site, as it is the place where Gautama Buddha gave his first sermon after attaining enlightenment. The site is home to a number of Buddhist temples and monasteries, as well as a museum.