Correct option is C
Xuan Zang and other pilgrims spent time studying in Nalanda, the most famous Buddhist monastery, located in Bihar.
Nalanda was a Buddhist monastery in the ancient kingdom of Magadha (modern-day Bihar) in India.It is revered as one of the most famous Buddhist monasteries and a renowned center of learning. Chinese Pilgrims like Xuan Zang spent a lot of time at the Nalanda University and wrote records. He mentions that the teachers were the men of the highest ability. They sincerely followed the teachings of Buddha.
It is a UNESCO World Heritage Site.
Kumargupta founded Nalanda University in the 5th century A.D. He was also called Shakraditya.