Step 1: Understanding the Question:
We need to arrange two of the three given alternatives (A, B, C) to form a coherent paragraph between the given first (S1) and last (S4) sentences.
Step 2: Detailed Explanation:
Let's analyze the logical flow:
S1 introduces Nalanda as one of the "greatest centres of learning in the ancient world."
S4 concludes with a quote from the Dalai Lama emphasizing Nalanda's importance as the source of Buddhist knowledge.
Now let's examine the connections between the sentences:
- Sentence A provides a factual introduction to Nalanda, explaining what it was (the world's first residential university) and its scale (10,000 students). This is a perfect follow-up to S1, which introduces Nalanda as a "great centre of learning."
- Sentence C describes what the students learned. The pronoun "They" in "They gathered here..." logically refers to the "10,000 students" mentioned in Sentence A. This creates a strong link between A and C. Furthermore, the mention of learning "Buddhist principles" in C provides a smooth transition to S4, which is a quote about Buddhist knowledge.
- Sentence B talks about the founders of the university. While interesting, it's a secondary detail compared to what the university was and what was taught there. Placing it between A and C would disrupt the flow from describing the students to describing what they learned.
Let's test the sequence AC:
S1: Introduces Nalanda as a great center of learning.
S2 (A): Elaborates on what Nalanda was (a university with 10,000 students).
S3 (C): Explains what "They" (the students from A) learned, including Buddhist principles.
S4: Concludes with a quote about Buddhist knowledge, linking directly to C.
This sequence (S1-A-C-S4) is logical, coherent, and flows smoothly. The pronoun reference is clear, and the ideas progress from general to specific.
Step 3: Final Answer:
The correct order for S2 and S3 is A followed by C. Therefore, option (A) is the correct choice.