How Would a Nurse Researcher Ensure That the Sample Used

How would a nurse researcher ensure that the sample used in a quantitative study is homogeneous?

A) Use eligibility criteria to limit extraneous variables relevant to the study.
B) Randomly assign subjects to either the experimental or the control group.
C) Assign one research assistant to collect data from all subjects.
D) Collect data from all subjects at the same time of day.

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