What does India's long land boundary show?

Correct answer: Contact with neighbouring countries on land

The direct answer is A: India’s long land boundary shows contact with neighbouring countries on land. A land boundary is the line where one country’s land territory meets another country’s land territory. The reasoning is: India has a large mainland; that mainland touches several neighbouring countries; therefore a long land boundary indicates many points or stretches of land contact and the possibility of land-based relations, movement and exchange. Option A is correct because it states the meaning of a land boundary. Option B is wrong because sea depth is a measurement of underwater water, not a land-border fact. Option C is wrong because the length of the land boundary does not tell us only the number of islands. Option D is wrong because weather temperature is a climate or atmospheric matter, not a direct meaning of boundary length. A boundary itself does not automatically prove friendly relations, but it does show geographical contact with land neighbours. Memory cue: land boundary means land neighbours; coastline means contact with the sea.