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It has been hypothesized that a chemical known as BW prevents colds. To test this hypothesis, 20,000 volunteers were divided into four groups. Each volunteer took a white pill every morning for one year. The contents of the pill taken by the members of each group are shown in the chart below.


Which group served as the control in this investigation?
A. Group 1
B. Group 2
C. Group 3
D. Group 4

It Has Been Hypothesized That A Chemical Known As BW Prevents Colds To Test This Hypothesis 20000 Volunteers Were Divided Into Four Groups Each Volunteer Took A class=

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