Question: Randomly assigning participants to groups helps a randomized experiment identify causes by A.eliminating demand effects as much as possible B.getting the groups to be similar

Randomly assigning participants to groups helps a randomized experiment identify causes by A.eliminating demand effects as much as possible B.getting the groups to be similar to each other before the difference in treatment C.getting the sample to be as representative of the population as possible without weighting D.helping as much as possible to avoid regression toward the mean

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