A Nurse Researcher Should Consider Mortality a Threat to the Study's

A nurse researcher should consider mortality a threat to the study's internal validity for which of these reasons?

A) There is concern that the intervention may have harmful effects on participants.
B) Those who dropped out of the study may be different than those who remained in the study.
C) Those who participated in the study may have died as a result of being in the study.
D) There is concern that the design is inappropriate for the study question if a large number of participants dropout of a study.