Dr. Drew is studying the effect of overexposure to UV radiation in mice. He discovers that mice that are exposed to high levels of UV radiation are much more likely to acquire cancer than mice that are not exposed to UV radiation. Which of the following best explains why high levels of UV radiation can cause cancer in mice?

A. UV radiation can alter an organism's DNA molecules and cause mutations.

B. UV radiation increases the activity level of an organism.

C. UV radiation can cause an organism to have an allergic reaction.

D. UV radiation decreases the amount of food that an organism consumes daily.