Despite large deltas on the eastern coast, why may natural harbours be less favourable?

Correct answer: Shallow deltaic coast and sediment deposition can hinder ships

The direct answer is option A. A delta forms where a river deposits large amounts of silt, sand, and clay near its mouth. This deposited material makes the coast shallow and may create shifting channels, sandbars, and mudflats. Ships need sufficiently deep and stable water to enter and leave a harbour safely, so continuous sediment deposition can make a deltaic coast less favourable for a natural harbour. Option A is correct because it gives both causes: shallow water and sediment accumulation. Option B is wrong because deltas generally build low, shallow land rather than always creating very deep seas. Option C is wrong because waves do occur along the eastern coast; the issue is sediment and coastal shape, not absence of waves. Option D is wrong because the Eastern Ghats are landforms along the eastern side of India and are not located inside the sea. Exam cue: delta means deposition, shallow water, and possible navigation difficulty.