3. What statement best describes an independent variable?
A. The factor that does not change, but impacts the constant in an experiment
B. The factor that's changed by the experimenter and impacts the constant in an experiment
C. The factor that's not changed by the experimenter and is impacted by the dependent variable
D. The factor that's changed by the experimenter and impacts the dependent variable

AnswerD. The factor that's changed by the experimenter and impacts the dependent variableExplanationThe term independent mean not interfered with. It stands on its on without been affected. In an experiment the term independent factor is one which is not affected by another  variable although it does change in the experiment but is is impacted by the dependent variable.

The independent variable is changed by the experimenter to get an effect from the dependent variable. Therefore, the best answer is D.