Answer:
Option (1).
Step-by-step explanation:
Depression may be defined as the medical condition in which the individual loses the ability to participate in the social activity. The individual needs anti depressant to treat the depression.
The new drug of the effect gas been noticed by Reynaldo. The experiments must include the control group that do not receive the supplement. The control group is used to compare with the individuals that receive the supplement and the effect of the new drug on the patient suffering from depression.
Thus, the correct answer is option (1).