Through which routes was India's contact with the outside world formed?

Correct answer: Through land and sea routes

Direct answer: Option B, through land and sea routes. India has a central position between eastern and western parts of Asia and is surrounded by the sea on three sides. Step by step: people could travel over land through passes and connected regions; ships could travel along the Arabian Sea, Indian Ocean, and Bay of Bengal; traders, travellers, religions, languages, ideas, and goods moved through both kinds of routes. Option A is wrong because contact was not limited to polar regions. Option B is correct because both land routes and maritime routes helped India communicate with the outside world. Option C is wrong because air travel belongs to the modern period and cannot explain ancient contacts. Option D is wrong because desert caves were not the main organised routes of international exchange. Exam cue: ancient contact usually means land routes plus sea routes.