India's northern part is linked with what type of boundary?

Correct answer: Mountain boundary

The governing concept is the physical nature of India’s northern boundary. The Himalayas form a high mountain arc along the north of the Indian subcontinent. They act as a major physical barrier between India and the Tibetan Plateau and have strongly influenced climate, drainage and historical movement. Thus, option A, mountain boundary, is correct. A sandy coastline is a coastal feature and cannot describe the inland northern frontier. An island boundary would require the country’s northern edge to be formed by islands, which it is not. An ocean trench is a deep submarine feature, not India’s northern land boundary. The question therefore tests basic location and extent knowledge.