How Would an Investigator Ensure That a Sample Is Homogeneous

How would an investigator ensure that a sample is homogeneous?

A) By restricting eligibility criteria to control for extraneous variables relevant to the study.
B) By randomly assigning subjects to either the experimental group or the control group.
C) By assigning one research assistant to collect all data.
D) By collecting all the data at the same time of day.

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