Which red and blue are more suitable for making clean violet?

Correct answer: Bluish red and reddish blue

The governing concept is subtractive mixing based on pigment bias. Violet is produced from red and blue, so the cleanest result comes from a bluish red and a reddish blue; both pigments lean toward violet and contain less unwanted yellow or green influence. Option B is therefore correct. Orange-biased red, green-biased blue, and yellow-biased pigments introduce opposing components that lower saturation and make violet dull or muddy.