In many bird species, males are brightly colored, while females are dull in color. How might this adaptation become more common over time?

Through breeding over time with the lighter colored males, The lighter color in the males feathers help find out which male is better compared to the others, in other words the brighter colored males have a higher chance at getting the females, and eventually if these males have a higher chance at successfully mating the dominating colors of the males will be passed down to the future offspring, making it more common for birds to have a more colorful or lighter pigment in male species, or just in general in both genders, depending on the way the genes are carried from parent to offspring.

Explanation:

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the answer will be a) proteins i believe