Who was Radhagupta, and what was his historical significance in the early reign of Ashoka?

Options:

• A: He was a Greek ambassador who succeeded Megasthenes and wrote about Ashoka's coronation.
• B: He was a Mauryan minister who supported Ashoka in the war of succession against Susima and became his Chief Minister (Agratyatva).
• C: He was the Buddhist monk who performed the coronation ceremony of Ashoka at Pataliputra.
• D: He was the chief architect who designed the palace of Ashoka and the Ashokan pillars.

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