The correct option is C Ladakh
Option C is the correct answer. Ladakh is the largest (area wise) Lok Sabha constituency. The top five area-wise constituencies are: Ladakh (173,266 sq km), Barmer (71,601 sq km), Kutch (41,644 sq km), Arunachal West (40,572 sq km) and Arunachal East (39,749 sq km).