Why is it essential that the experimental and control groups be treated identically in every respect but one?
A. So that the dependent variable can be accurately measured using the operational definition stated by the experimenter
B. So that the results will apply outside the laboratory setting
C. So that the manipulation of the dependent variable is the only thing that varies for the groups
D. So that if the behavior of the two groups differs, the difference can be attributed to the independent variable
Answer: D
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