In Schachter and Singer's Classic Experiment, Participants Were Injected with Epinephrine

Multiple Choice

In Schachter and Singer's classic experiment, participants were injected with epinephrine and either informed or not informed about the drug's effects. Participants were later asked to rate their own emotional states. Which alternative below correctly names and identifies a variable in this experiment

A) independent variable-whether participants were informed about epinephrine's effects
B) dependent variable-whether participants were informed about epinephrine's effects
C) control variable-participants' own emotional state
D) experimental variable-whether participants were informed about epinephrine's effects