People with lighter skin tones are mostly from Europe. What evolutionary advantage did light skin offer?

a. The ability to process Niacin through the skin.
b. The ability to avoid skin cancer in cold climates.
c. The ability to process vitamin D from The sun.
d. The ability to process sodium through bathing in salt water.

Explanation:

Melanin causes skin pigmentation, lowers the skin's ability to make vitamin D in response to sunlight exposure and some studies show that older adults with darker skin are at high risk of vitamin D deficiency

If there is lighter skin tones of people, it implies that the amount of Vitamin D is more in those people and skin of those people have the ability to process vitamin D from the sun