Discussion
Assertion (A): A cationic softener is not applied to a brightened white fabric.
Reason (R): It interacts with the anionic brightener and quenches its fluorescence.
Answer: C
Both are true and the reason gives the mechanism: the two carry opposite charges, and non-ionic or specially selected products are used where a high white must be kept. The loss appears only after the softener is applied.
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