The correct answer is (d) Sarnath.
Sarnath is a city in the Indian state of Uttar Pradesh. It is located 10 kilometres (6.2 mi) east of Varanasi, the holiest city of Hinduism and one of the seven sacred cities of Jainism. Sarnath is a major Buddhist pilgrimage site, as it is the place where Gautama Buddha gave his first sermon, setting in motion the wheel of Dharma. The site is home to many Buddhist temples, monasteries, and stupas.
Devapattan is a town in the Indian state of Uttar Pradesh. It is located in the district of Lakhimpur Kheri. The town is a popular pilgrimage site for Hindus and Jains.
Kaushambi is an ancient city in the Indian state of Uttar Pradesh. It is located on the banks of the Ganges River, about 100 kilometres (62 mi) south of Varanasi. The city was once the capital of the Kosala Kingdom. It is a major archaeological site, with ruins of temples, palaces, and stupas.
Kushinagar is a town in the Indian state of Uttar Pradesh. It is located in the district of Kushinagar. The town is a popular pilgrimage site for Buddhists, as it is the place where Gautama Buddha attained Mahaparinirvana, or final nirvana.