What is an independent variable? Group of answer choices A. The variable that changes because another variable changes B. A variable most often found on the Y-axis. C. Independent variables are only found on pie charts. D. The variable the experimenter changes or manipulates.

D. The variable the experimenter changes or manipulates.

Explanation:

The independent (or manipulated) variable is something that the experimenter purposely changes or varies over the course of the investigation. The dependent (or responding) variable is the one that is observed and likely changes in response to the independent variable.