Explanation:

3rd option is correct.
During Chandra Gupta II, Chinese traveller Fa-hien visit India.
The accounts of Fa Hien give a contemporary account of the administration of Chandragupta Vikramaditya. Fa Hien (337 – ca. 422 AD) was so much absorbed in his quest for Buddhist books, legends, and miracles that he could not mention the name of the mighty monarch in whose rule he lived for 6 years. The picture he depicted cannot solve all the queries of the historians of today yet, they give a vivid picture of the state of the country.