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

The Pennar river is the correct answer because it carved the Gandikota canyon, often called the "Grand Canyon of India," as it cuts through the Erramala hills in Andhra Pradesh. The Cauvery is a common distractor due to its prominence in South Indian geography, but it flows significantly further south and is not associated with this specific geological formation. This question tests the core concept of fluvial landforms and the specific drainage patterns of Peninsular India.