Blue Hair Color In The New Glacier Population Of Elves, Normal Hair Color Is Blue. Some Elves Have Very Light Blue Hair?

In the new glacier population of elves, normal hair color is blue. Some elves have very light blue hair? - blue hair color

while other elves have their hair in dark blue. In this population, the Elf, the most coveted color of hair is normal blue - with a very light blue or dark hair, blue-haired eleven o'clock as less desirable and are normal to mate and produce more offspring. Therefore, the frequency of light blue and dark blue hair from eleven population. What kind of natural selection is going on?
a. disruptive selection
b. stabilizing selection
c. directional selection
d. Natural selection