Discussion
Assertion (A): A single sample can be colour inconstant without any pair being involved.
Reason (R): Inconstancy is a property of one sample rather than of a pair.
Answer: C
Both are true and the reason gives the distinction, and both members of a metameric pair may also be inconstant. The two properties are logically independent. Either may occur without the other. The two properties are logically separate.
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