The part under 'The Civil Rights Act'
Explanation:
The Doon Valley is an unusually wide, long valley within the Sivalik Hills and the Lesser Himalayas, in the Indian states of Uttarakhand, Himachal Pradesh and Haryana. Within the valley lies the city of Dehradun, the capital of Uttarakhand state.
I would say, A, because we use it every day in our lives.
