Answer:
b. are subtractive primary colors.
Step-by-step explanation:
Complementary colors are pairs of colors that are opposite each other on the color wheel. They are considered subtractive primary colors because they are used in subtractive color mixing, which involves mixing pigments or dyes. When complementary colors are mixed together, they tend to produce neutral or grayish tones. For example, the complementary colors of red and cyan, or blue and orange, are pairs that create a sense of contrast and balance when placed next to each other. Complementary colors do not produce white light when added together; instead, they create a visual effect of canceling out or neutralizing each other.