A Scientist Wants to Study the Effect of Vitamin C

Multiple Choice

A scientist wants to study the effect of vitamin C on colds.He recruits 100 people with colds and gives the experimental group 1000 mg of vitamin C per day.What would be an appropriate control?

A) Give the control group nothing.
B) Give the control group 2000 mg of vitamin C per day.
C) Give the control group orange juice every day.
D) Give the control group a pill similar to vitamin C but containing sugar (a placebo) .
E) Give the control group 1000 mg of another brand of vitamin C per day.