Exp) Option b is the correct answer.

Option b is correct: Fa-hien (Faxian), the Buddhist scholar from China, visited India (AD 399–414) during the reign of Chandragupta II. He records the prosperity of the Gupta Empire. He came to visit various Buddhist monasteries and took copies of religious texts. He visited Peshawar, Taxila, Mathura, Kannauj, Sravasti, Kapilavastu, Sarnath and many other places. He compiled a travelogue “Record of Buddhistic Kingdoms”. His book details the religious and social life of Indians at that time.

• Chandragupta II ruled the Gupta empire for 40 years from c. 375 to 415 CE. He came to power after a succession struggle with his brother Rama Gupta. He is also known as Vikramaditya. The reign of Chandragupta II saw the high watermark of the Gupta empire. He extended the limits of the empire by marriage alliances and conquests.

Details of India as per Fa-hein’s Account:

The following aspects of India can also be found from his book:

• Buddhism and Hinduism were the most popular religions at that time. Buddhism was more popular in Punjab, Bengal and the region around Mathura.
• He studied Sanskrit Language in Pataliputra.
• He described internal and foreign trade of India as well as its ports.
• India had trade relations with China, countries of South-East Asia, Western Asia and as well as with Europe.

Source:

History – Tamil Nadu Board SCERT XI (New), Chapter – 7, The Guptas, Pg. 109

Ancient History – NCERT XI, Chapter – 20, Rise and Growth of the Gupta Empire, Pg. 142 – 143

Indian Art & Culture, Nitin Singhania, Chapter – 26, India through the eyes of Foreign Travelers.