The most notable example of a tectonic valley is that of the

The correct answer is: A. Doon valley.

A tectonic valley is a valley formed by the movement of tectonic plates. The Doon valley is a tectonic valley located in the Indian state of Uttarakhand. It is a long, narrow valley that is surrounded by mountains. The valley is home to the city of Dehradun, which is the capital of Uttarakhand.

The Kashmir valley is a valley located in the Indian state of Jammu and Kashmir. It is a large, fertile valley that is surrounded by mountains. The valley is home to the city of Srinagar, which is the summer capital of Jammu and Kashmir.

The plains