Answer:
Group A, because they expected positive feelings from the drug.
Explanation:
In psychology, the two-factor theory was proposed by two different researchers named Jerome E. Singer and Stanley Schachter during 1962, and is considered as a theory which is based on "emotion" consisting two distinct factors including 'cognitive label' as well as 'physiological arousal'.
According to Schachter and Singer, when an individual experience or feels an emotion then specific physiological arousal happens or occurs and therefore he or she uses an immediate environmental cue to find "emotional cue" in order to signify the physiological arousal.