A researcher tests the hypothesis that large, daily doses of vitamin C help protect against catching the common cold. What would be the best experimental and control group to test this hypothesis?
A. Experimental group: takes a large dose of vitamin C daily;
Control group: takes nothing.
B. Experimental group: takes a large, daily dose of vitamin C;
Control group: takes a daily dose of a sugar pill disguised as vitamin C.
C. Experimental group: takes a large dose of vitamin C daily;
Control group: takes a large weekly dose of vitamin C.
D. Experimental group: people with a cold are administered vitamin C daily;
Control group: people without a cold are not administered vitamin C.
Answer: B
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