Which Action Represents the Nurse Researcher's Attempt at Constancy in Data

Which action represents the nurse researcher's attempt at constancy in data collection to control extraneous variables in a study examining the effect of hormone replacement therapy on bone-density loss in postmenopausal women?

A) Drawing the blood at the same time of day for all subjects
B) Having the same phlebotomist drawing the blood from all subjects
C) Using the same room for drawing blood from all subjects
D) Ensuring that all subjects were postmenopausal women taking hormone replacement therapy

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