What is a control group? A. A group that changes the variable
B. The group that applies the variable
C. The group that tests the variable
D. A test group where the variable is not changed or applied

D

Explanation:

A control group is the variable that remains constant throughout the whole experiment

The control group is defined as the group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do.

Explanation:

The purpose of a control group is to ensure that the independent variable you are testing is really causing the outcomes in the experimental group.