A Researcher Wants to Know How Effective a New Suntan

Multiple Choice

A researcher wants to know how effective a new suntan lotion is at preventing skin cancer caused by UV radiation. She uses mice as test subjects to model the effects for humans. Which of the following is the best control for this experiment?

A) Only mice in the control group are shaded during the experiment.
B) Mice in the test group receive twice as much UV radiation as those in the control group.
C) No suntan lotion is applied to mice in the control group; lotion is only applied to the test group.
D) Mice in the test group are from a genetic line that increases their susceptibility to UV radiation.
E) Mice in the control group are provided lotion in their drinking water to maximize effectiveness.