Discussion
Assertion (A): No set of three real primaries can match every spectral colour additively.
Reason (R): Some spectral colours lie outside the triangle those primaries define.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Three real primaries define a triangle in the chromaticity diagram, and additive mixture can only reach points inside it. The spectrum locus is convex and lies partly outside any such triangle, so the most saturated spectral colours are unreachable - the origin of the negative values in the matching data.
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