Answer:
d. would block emotional memory.
Explanation:
REP study means research experience program where students learns skills and techniques from the research or activity they are doing and produces he project on the progress that they have made.
Cahill and McGaugh study aimed to do study and research on the role of amygdala and adrenaline on the emotional memory formation in one's brain. It showed the effects of emotions on the memories.
Beta blocker are a kind of drug that tries to stop the stimulation of adrenergic receptors when given. They control heart beat, blood pressure which affects the emotions. It will also prevent the emotional memory to function properly.
Thus the answer is ---
d. would block emotional memory.