The group used for baseline comparison and not given the active treatment is called

• A. Questionnaires
• B. Respondents
• C. Primary data
• D. Control group

Answer: (D)

In experimental setups, you compare what happens with the treatment to what would happen without it, using a baseline reference. The group that does not receive the active treatment serves exactly that role: it’s the control group. By comparing outcomes between the treated group and this control group, you can attribute any differences to the treatment itself rather than other factors. Randomly assigning participants helps ensure the groups start similar, so the comparison is meaningful.

Other terms don’t describe this purpose. Questionnaires are a way of collecting data, not a participant group. Respondents are the people providing data, not the role of a baseline in an experiment. Primary data means data you collect yourself for the study, not the structure of the comparison group.