Explanation:

Let’s look at each Chinese pilgrim:

- Hiuen Tsang: Visited India during Harsha’s reign (~7th century CE), much later than the first Gupta ruler.

- Fahien: ?? Visited India during the reign of Chandragupta II (early 5th century CE), he provides valuable information about the Guptas.

- Itsing: Came to India in the late 7th century CE, again after the Gupta period.

- Wang Hiuen Tse: Came even later, during the 7th century, and did not record information about the first Gupta rulers.

Correct answer: Option 2, Fahien.