Dr. Harbinger is studying a new psychotherapy treatment for depression. He carefully screens potential participants to make sure they fit strict diagnostic criteria and randomly assigns them to a treatment or control group. He is most likely conducting a(n) study.

Efficacy

Explanation: When the evaluation of a treatment or intervention is performed under well laid out and defined guidelines, such study is most likely classed as an efficacy study. Efficacy studies usually require that participants and environmental factors meet certain requirements and the risk of external or confounding variables or constraints impacting the research study is avoided or reduced to the barest minimum.

Dr. Harbinger's study as described above is most likely to be an efficacy study as it required participants to meet strict diagnostic criteria before being assigned to a group.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

the answer is       political office  

hope this .