The Role of Ultraviolet Light Is Significant in Human Evolution

The role of ultraviolet light is significant in human evolution because:

A) too little of this light can lead to overproduction of Vitamin D.
B) too much of this light can destroy folic acid, needed for healthy fetal development.
C) too much of this light can lead to cancer in old age.
D) too much of this light can impede the ability of the body to use vitamin C.