The correct answer is (c). The Indo-China War of 1962 was a military conflict between India and the People’s Republic of China. The war was fought over the disputed border between the two countries, and resulted in a Chinese victory. The trade between Uttarakhand and Tibet was closed after the war, as the border between the two countries was closed.
The Kargil War was a conflict between India and Pakistan that took place in the Kargil district of Kashmir in 1999. The war was fought over the disputed territory of Kashmir, and resulted in a victory for India. The trade between Uttarakhand and Tibet was not affected by the Kargil War.
The Doklam Episode was a military standoff between India and China that took place in the Doklam region of the Himalayas in 2017. The standoff was over the construction of a road by China in the disputed area. The trade between Uttarakhand and Tibet was not affected by the Doklam Episode.
The Indo-Pak War of 1971 was a war between India and Pakistan that took place in 1971. The war was fought over the independence of Bangladesh, and resulted in a victory for India. The trade between Uttarakhand and Tibet was not affected by the Indo-Pak War of 1971.