At Folger University, Drs. Chase and Sanborn are conducting an experiment on the effects of caffeine on memory. Participants are randomly assigned to a caffeine or a no-caffeine group; their recall of items on a word list is later assessed. Which pair correctly identifies a variable in this experiment?
A) caffeine â€" dependent variable
B) word recall â€" experimental variable
C) caffeine â€" independent variable
D) word recall â€" independent variable
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