Which Situation Represents a Threat to Internal Validity in an Experimental

Which situation represents a threat to internal validity in an experimental study measuring the effect of a videotape of home-going instructions for patients being discharged after coronary artery bypass graft surgery?

A) Both men and women were included as subjects in the study.
B) Two new surgeons began performing the coronary artery bypass graft surgeries.
C) Patients in the experimental group discussed aspects of the tapes with patients in the control group.
D) Data collection took 1 year.

Correct Answer:

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