One Reason Random Assignment Is Considered Important in Experimental Research

One reason random assignment is considered important in experimental research is because:

A) it allows researchers to determine which two variables are correlated to one another.
B) it allows a more representative sample of participants to be chosen for the study .
C) it allows researchers the ability to infer cause and effect.
D) it both allows a more representative sample of participants to be chosen for the study and it allows researchers the ability to infer cause and effect.

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