A.
Megasthenes, Fa-Hien, Xuanzang, Al-Biruni
B.
Fa-Hien, Megasthenes, Xuanzang, Al-Biruni
C.
Megasthenes, Xuanzang, Fa-Hien, Al-Biruni
D.
Al-Biruni, Megasthenes, Fa-Hien, Xuanzang
Explanation
Why Correct: Megasthenes visited the Mauryan court of Chandragupta Maurya around 302-298 BCE. Fa-Hien traveled during the Gupta period under Chandragupta II around 399-411 CE. Xuanzang visited during Harshavardhana's reign around 630-645 CE. Al-Biruni accompanied Mahmud of Ghazni's invasions and wrote Kitab-ul-Hind around 1030 CE.
Distractor Analysis: Placing Fa-Hien before Megasthenes incorrectly reverses their chronological order by about 700 years. Putting Xuanzang before Fa-Hien misplaces their sequence by approximately 200 years. Starting with Al-Biruni places the medieval traveler before all ancient travelers, disrupting the historical timeline.
Takeaway: These travelers' accounts provide crucial historical sources: Megasthenes on Mauryan administration, Fa-Hien on Gupta-era Buddhism, Xuanzang on Harsha's empire, and Al-Biruni on early medieval Indian society and sciences.