If a red pigment has a blue bias what kind of orange may result when it is mixed with yellow?

Correct answer: Slightly dull or brownish

The governing concept is pigment bias in subtractive mixing. A blue-biased red contains a small influence of blue; when yellow is added, that unwanted blue influence works against the desired orange and can reduce saturation. The result may therefore look dull, muted or slightly brownish rather than clear and bright. Option B is correct; the mixture does not become completely green or cyan.