Doddabetta peak is considered to be located in which hill region?

Correct answer: Nilgiri

Option C, Nilgiri, is correct. Doddabetta is the highest peak of the Nilgiri Hills in Tamil Nadu and is located close to Ooty. The geographical reasoning is based on identifying the hill region containing the peak: Doddabetta belongs to the Nilgiri group, which forms part of the Western Ghats in southern India. Vindhya is a separate central Indian range, Ladakh is a high-altitude region in the trans-Himalayan north, and the Rajmahal Hills are in eastern India. These locations are therefore unsuitable. The Doddabetta–Ooty–Nilgiri association is the key fact that leads to option C.