Question

what will his control group be in this experiment? a group that does not receive caffeine, to act as a comparison a group that receives caffeine to act as a comparison a group where test scores are measured a group where test scores are not measured

Explanation:

In an experiment, a control group is not exposed to the independent variable (in this case, caffeine) to serve as a baseline for comparison.

Answer:

A. A group that does NOT receive caffeine, to act as a comparison