Why Should a Nurse Researcher Consider Mortality a Threat to the Internal

Why should a nurse researcher consider mortality a threat to the internal validity of a study?

A) There is a concern that the intervention may have harmful effects.
B) Those who participated in the study may have died as a result of being in the study.
C) Those who dropped out of the study may be different from those who remained in the study.
D) When a study has a large number of participants who drop out of the study, the design is inappropriate for the study questions.

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