If a neutral made by mixing blue and orange appears too cool, what should be increased?

Correct answer: Orange

The governing concept is colour temperature controlled by mixture proportion. Blue contributes a cool bias, whereas orange contributes a warm bias. If the neutral mixture appears too cool, increasing orange gradually counterbalances the blue and moves the mixture toward a warmer neutral. Adding more blue would intensify the problem; black changes value and white creates a lighter tint rather than correcting temperature. Hence option B is correct.