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