The Greatest Incidence of Skin Cancer (Melanoma) Would Be Expected

The greatest incidence of skin cancer (melanoma) would be expected to occur in

A) people who are deficient in vitamin D and live near the poles.
B) people who are deficient in folate and live near the poles.
C) people who are deficient in vitamin D and live near the equator.
D) people who are deficient in folate and live near the equator.