Correct Option: A

The Purvanchal Range is an eastward extension of the Himalayas in the north-eastern region of India. It comprises the Patkai hills, the Manipur hills, Bairal range, the Mizo hills and the Naga Hills. It is a densely forested area, mainly composed of strong sandstones. The peaks in the Purvanchal mountain range are not rugged or high. The ideal route to this mountain range is offered by the Pangsau Pass.