Gandikota canyon of South India was created by which one of the following rivers?

The Gandikota Canyon, also known as the Grand Canyon of India, is located in Andhra Pradesh.

It was formed by the Pennar River which cuts through the Erramala hills.

The Gandikota fort is situated on the right bank of the Pennar river in the Kadapa district.

Therefore, the correct answer is Pennar.

Sources:

• Wikipedia - Gandikota
• Andhra Pradesh Tourism