Sentences of a paragraph are given below. While the first and the last sentences (S1 and S4) are given, some sentences (S2 and S3) are missing. Identify the alternative that will meaningfully fill in the gap.

S1. After spending a night in the town of Bodhgaya, the ancient settlement where Lord Buddha is said to have attained enlightenment, I set out that morning for Nalanda, whose red-brick ruins are all that remain of one of the greatest centres of learning in the ancient world.
S2. ____________
S3. ____________
S4. As the Dalai Lama once stated: "The source of all the [Buddhist] knowledge we have, has come from Nalanda".

Alternatives:

A. Founded in 427 CE, Nalanda is considered the world's first residential university, a sort of medieval Ivy League institution home to nine million books that attracted 10,000 students from across Eastern and Central Asia.

B. Interestingly, the monarchs of the Gupta Empire that founded the monastic university were devout Hindus, but sympathetic towards Buddhism.

C. They gathered here to learn medicine, logic, mathematics and - above all - Buddhist principles from some of the era's most revered scholars.