The definition of an experimental control is the variable we change in the set up of an experiment (option A)..
What is an experimental control?
An experimental control are techniques that scientists utilize to minimize the effects of extraneous experience and environmental variables as well as to strengthen the inference that changes in the dependent variable are due to the independent variable.
The experimental control allows the experimenter to minimize the effects of factors other than the one being tested.
Therefore, it can be said that the definition of an experimental control is the variable we change in the set up of an experiment.
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