Mixing two complementary colors together _ them.

One of the rules we learn as painters is that color opposites cancel each other out when mixed. In other words, when we combine a pair of complementary colors on our palette, the original or parent colors lose their intensity or chroma. They mix into a black or brown. In art classes or workshops we are typically directed to take these three pairs of color opposites, mix them and paint a swatch of the results. You can see an example here.

Complementary colors are pairs of colors which, when combined or mixed, cancel each other out (lose hue) by producing a grayscale color like white or black. When placed next to each other, they create the strongest contrast for those two colors.

Explanation:

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i would think b and c