Researchers Studying the Effects of Caffeine on Reaction Times Had

Multiple Choice

Researchers studying the effects of caffeine on reaction times had participants drink either a beverage that contained caffeine or a decaffeinated version of the same beverage.In this study, the experimental group is:

A) the participants who drink the decaffeinated beverage
B) the participants with the slowest reaction times
C) all the people who take part in the study
D) the participants who drink the beverage with caffeine