Explanation:

- Option 1: Harshavardhana

- Banabhatta was indeed the court poet of Harshavardhana, who ruled in the early 7th century.

- Harshavardhana was a notable ruler of north India, and Banabhatta penned the famous work "Harshacharita", which is a detailed biography of Harsha.

- This is the correct answer.

- Option 2: Pulakesin II

- Pulakesin II was a ruler of the Chalukya dynasty in South India.

- He is not associated with Banabhatta.

- Option 3: Yasovarman

- Yasovarman was a ruler in central India who ruled in the 7th century.

- There is no historical evidence linking Banabhatta to Yasovarman.

- Option 4: Chandra Gupta II

- Chandra Gupta II was a powerful emperor of the Gupta dynasty in the 4th century.

- He had many poets in his court, but Banabhatta was not one of them.