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 participants to either the experimental or the control group.
C) Assign one research assistant to collect data from all participants.
D) Collect data from all participants at the same time of day.

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