What result is commonly obtained by mixing blue and orange?

Correct answer: Muted brown or grey

The governing concept is complementary-colour neutralisation. Blue and orange are opposite on the colour wheel, so mixing their pigments reduces saturation and commonly gives a muted brown, greyish brown, or other dull neutral. Add one colour gradually because unequal pigment strength can shift the exact result. Blue and orange do not produce bright pink, pure yellow, or bright green in ordinary paint mixing. Thus option B is the best answer.