The McMohan Line is a bone of contention between

Correct option is A

The McMahon Line is a significant geopolitical border that serves as a bone of contention between **India and China**. This line was established as part of the Shimla Accord in 1914, intended to demarcate the boundary between Tibet (then a part of China's sphere of influence) and British India. However, the legitimacy of the McMahon Line has been a longstanding issue in Sino-Indian relations, with China refusing to recognize it as the official boundary. This disagreement over the boundary line has led to various diplomatic and military standoffs between the two countries, including the Sino-Indian War of 1962. The McMahon Line primarily runs along the northeastern region of India and the Tibetan Autonomous Region of China, highlighting the strategic and sensitive nature of territorial disputes in the Himalayan area.