A researcher randomly assigns participants to a high-intensity exercise or a low-intensity exercise program group. At the end of the study, she finds that about half the participants in the high-intensity exercise group dropped out of the study, whereas no participants dropped out of the low-intensity exercise group. Which statement about this research situation is true?
A. The study demonstrates evidence of homogeneous attrition and so it will be associated with low external validity.
B. The study demonstrates evidence of heterogeneous attrition and so it will be associated with low external validity.
C. The study demonstrates evidence of heterogeneous attrition and so it will be associated with low internal validity.
D. The study demonstrates evidence of homogeneous attrition and so it will be associated with low internal validity.
Answer: C
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