According to the Observations of a Nutrition Scientist,laboratory Mice Are

According to the observations of a nutrition scientist,laboratory mice are healthier when their diet contains physiological levels of vitamin D than when their diet lacks the micronutrient.The scientist hypothesizes that mice will be less likely to develop cancer when they consume a diet that supplies megadoses of vitamin D.Based on this information,the scientist is ready to

A) plan a retrospective study involving at least 5,000 laboratory mice to test the vitamin D and cancer hypothesis in mice.
B) set up an experimental epidemiological study to test the vitamin D and cancer hypothesis in mice.
C) design a double-blind study to test the vitamin D and cancer hypothesis in mice.
D) conduct a controlled laboratory experiment to test the vitamin D and cancer hypothesis in mice.