Explanation:

- Banabhatta was the court poet of Harshavardhana. He is famous for writing the "Harshacharita," a biography of Harshavardhana, and "Kadambari," a classic Sanskrit novel.

- Ashoka, the Mauryan emperor, was known for his role in promoting Buddhism and his inscriptions, but there's no record of Banabhatta serving him.

- Kumaragupta was a Gupta emperor known for maintaining the empire established by his ancestors. There's no connection to Banabhatta.

- Bindusara, the Mauryan ruler and father of Ashoka, also bears no historical link to Banabhatta.

Your Answer: Option 1 - Harshavardhana