Which of the Following Is a Reason Why Experiments May

Which of the following is a reason why experiments may be hard to administer?

A) Competitors may deliberately contaminate the results of a field experiment.
B) It may be impossible to control for the effects of the extraneous variables.
C) Both A and B are reasons why experiments may be hard to administer.
D) Neither A nor B is a reason why experiments may be hard to administer.

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