Detailed Solution:
The correct answer is “Hiuen Tsang”.
Hiuen Tsang (Xuanzang) visited and studied at Nalanda University. He was a Chinese Buddhist monk and scholar who traveled to India in the 7th century during the reign of King Harsha Vardhana to obtain Buddhist scriptures.
Emperor Kumaragupta I of the Gupta dynasty founded Nalanda University in 427 CE.
Fahien visited India in the early fifth century during the reign of Chandragupta II and entered here from the northwest and reached Pataliputra. Chandragupta II (375 CE - 413/14 CE) was the next great Gupta emperor after his father Samudragupta.
Greek historian Megasthenes came to India during the reign of Chandragupta Maurya.