AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(B) Because not all depositors withdraw their money at the same time, and the rest can be lent out.
Banks in India keep about 5 per cent of deposits as cash reserves (Option C).
The question has a mismatch: the question body asks why (answered by option B), but the listed options A–D are percentages. The passage clearly states banks hold about 5 per cent of deposits as cash. Mention both: the correct reason (B) and the correct percentage (5 per cent / Option C) to cover all parts of the question.