Assertion (A): The Brahmaputra marks the Western-most boundary of the Himalayas.

Reason (R): These are known as Purvanchal or the Eastern hills and mountains.

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Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).

Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).

Assertion (A) is true, but Reason (R) is false.

Assertion (A) is false, but Reason (R) is true.

answer is D.

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Detailed Solution

The Brahmaputra River forms the Himalayas' easternmost frontier. Beyond the Dihang gorge, the Himalayas curve steeply to the south and sprawl to India's eastern border. The Purvanchal, or Eastern mountains, are their names. So, Assertion (A) is false
The Purvanchal or Eastern hills that extend through the northeastern states are largely made up of sedimentary rocks called sandstones. They are primarily parallel ranges and valleys covered in dense forests. Purvanchal is made up of the Patkai hills, Naga hills, Manipur hills, and Mizo highlands. Reason (R) is true

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