An Experimenter Wants to Study the Relationship Between Caffeine and Reaction

Multiple Choice

An experimenter wants to study the relationship between caffeine and reaction time.She assigns participants as follows: Group One receives 50 milligrams of caffeine;Group Two receives 100 milligrams of caffeine;Group Three receives 200 milligrams of caffeine;Group Four receives no caffeine.Twenty minutes later,all participants complete the reaction-time test.In this experiment,what was the dependent variable?

A) amount of caffeine
B) no caffeine
C) reaction time
D) assignment into one of four groups