If a question gives clues of kankar, old alluvium and higher plain, what will be the answer?

Correct answer: Bhangar

The direct answer is A: Bhangar. Alluvium is river-deposited material. Bhangar is the older alluvial terrace of the Northern Plains. It lies on relatively higher ground than the active floodplain and commonly contains kankar, or calcareous nodules. The reasoning is direct: kankar indicates older alluvium; old alluvium on a higher plain is Bhangar. Option A is therefore correct. Option B, Khadar, is newer alluvium deposited on the active floodplain and is regularly renewed by floods; it is usually lower, not the higher old surface described here. Option C, Terai, is a wet, marshy belt where streams re-emerge after passing through the porous Bhabar zone. It is not identified by old alluvium and kankar. Option D, Bhabar, is the coarse pebble and gravel belt near the Shiwalik foothills where water may disappear underground. It is not the old elevated alluvial plain in the clues. Memory rule: Bhangar is old, higher and kankar-rich; Khadar is new, low and flood-renewed.