Which mixture is more likely to create a cool brown?

Correct answer: Mostly blue-green with a little red-orange

The governing concept is colour temperature in a mixed neutral. Brown can be formed from opposing warm and cool tendencies, but its perceived temperature follows the dominant bias. A mixture led by blue-green with only a little red-orange is therefore more likely to produce a cool brown. Option B is correct; A remains warm because red-orange dominates, yellow with white makes a light tint, and red with yellow tends toward orange rather than brown.