The Greek ambassador Megasthanese visited the court of which of the following king?

Chandragupta Maurya

The correct answer is Option 1 - Chandragupta Maurya

The Greek ambassador Megasthenes visited the court of Chandragupta Maurya.

Megasthenes was sent to India by Seleucus I Nicator, the Seleucid king, to establish diplomatic relations with Chandragupta Maurya. Megasthenes spent several years at the Mauryan court, and he wrote a book about India called Indica. Indica is now lost, but it is quoted extensively by later writers, such as Strabo and Arrian.

Megasthenes' Indica provides valuable information about Indian society and culture during the Mauryan period. He writes about the Mauryan administration, the economy, the military, and the social structure. He also describes the religious beliefs and practices of the Indians.