The study of India's land boundary is important not only for knowing length but also for what?

Correct answer: To understand relations with neighbours and border security

The governing concept is that a land boundary is both a geographical limit and a political interface. India’s land borders meet neighbouring countries, so their study helps explain cross-border relations, movement of people and goods, border management, defence requirements, and cooperation or disputes. Thus option A is correct. Measuring sea depth is a marine activity, the Tropic of Cancer is a fixed latitude that cannot be removed, and converting area into time has no geographical or mathematical basis. The boundary’s significance therefore extends beyond its numerical length.