Answer:
The correct answer is ''a group comparison study.''
Step-by-step explanation:
The group comparison study is the study of a group of people or organizations that have not participated in a public intervention, which is compared with a group that has participated, in order to analyze the net effects of the intervention. Whatever the mode of selection of the comparison group, its characteristics should be as similar as possible to those of the direct recipients. To do this correctly, the specific characteristics of each group must be described in depth at the beginning of the study.