Biology

The correct answer is:

Control group.

In an experiment, the control group serves as the baseline or standard for comparison. It is treated exactly the same as the experimental group except for the factor (independent variable) being tested. This group does not receive the independent variable, allowing researchers to see what happens when the independent variable is absent or unchanged.

Here’s a breakdown of the other terms:

A.Experimental group: This group receives the independent variable and is tested to see how the independent variable affects the dependent variable....