Assertion (A): DNA replication must occur before mitosis begins.
Reason (R): DNA replication ensures each daughter cell receives a full set of genetic material.

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• A Both (A) and (R) are true and (R) explains (A).
• B Both (A) and (R) are true but (R) does not explain (A).
• C (A) is true but (R) is false.
• D (A) is false but (R) is true.

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