On Planet X,some Areas Receive a Lot of Ultraviolet Radiation

On Planet X,some areas receive a lot of ultraviolet radiation.What skin color would you expect Planet X's people to have if they live in those areas?

A) always light
B) always dark
C) light unless their diet contains a lot of Vitamin D
D) dark unless their diet contains a lot of Vitamin D
E) light unless their diet contains a lot of Vitamin A.