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Assertion (A) : Harshavardhana convened the Prayag Assembly. Reason (R) : He wanted to popularise only the Mahayana form of Buddhism.
Explanation
The correct answer is Option 2. Both the Assertion and Reason are individually true, but the Reason does not explain the occurrence of the Prayag Assembly.
Assertion (A) is true. Harshavardhana convened the Prayag Assembly (Quinquennial Assembly) every five years at the confluence of the Ganga, Yamuna, and Saraswati. This was a massive gathering where he practiced immense charity, distributing his wealth among scholars, the poor, and religious sects.
Reason (R) is also true. Harsha was a great patron of Mahayana Buddhism. He organized the Kanauj Assembly specifically to popularize Mahayana doctrines and honor Xuanzang. However, this reason does not explain the Prayag Assembly, which was primarily an assembly for charity and religious tolerance, involving followers of Buddhism, Brahmanism, and Jainism alike.
Since the Prayag Assembly was a platform for universal almsgiving rather than a specific tool for Mahayana propaganda, R is not the correct explanation for A.