The direction and structure of Purvanchal Hills are understood from which Himalayan bend?

North-eastern bend

The governing concept is the change in direction of the Himalayan mountain arc. After extending eastward, the Himalaya bends sharply toward the south and southeast around the eastern end of the range. The associated hill chains, including the Patkai, Naga, Mizo, and related Purvanchal Hills, form the northeastern extension of this system. In school geography, this is described through the north-eastern bend or turn of the Himalaya, so option B is correct. Option A places the bend in the wrong part of the mountain arc. Options C and D do not describe the Himalayan structural continuation and incorrectly suggest a southern or coastal setting. The key clue is the location and orientation of the Purvanchal ranges in northeast India.

This is a Class 10 General Knowledge question. Chapter: Indian Geography. Topic: Mountains and Plateaus of India.