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Which of the following statements are true?

I. Random assignment of treatments is an important feature of a well-designed experiment because it forms treatment groups that look similar to each other.

II. Controlling conditions in an experiment helps to reduce the effects of suspected confounding variables.

III. It is not possible for a well-designed experiment to have both randomization and control.

A

I only.

B

II only.

C

III only.

D

I and II only.

E

I, II, and III.

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