What can generally be formed by mixing yellow and violet?

Correct answer: Muted brown or grey

The governing concept is complementary colour theory. Yellow and violet are opposite colours on the colour wheel, and their paint pigments tend to cancel each other’s intensity. Consequently, a mixture commonly becomes a muted brown, greyish neutral, or muddy earthy colour rather than a bright hue. The final appearance depends on the proportions and pigment properties, so the colours should be combined gradually. Bright blue, pure red, and bright orange are not the expected results. Option C is correct.