Why is the pretest-posttest design NOT recommended for program evaluation?
A) With only two measures and no control group, almost none of the threats to reliability are controlled.
B) With only two measures, the clients do not have sufficient leeway to express their opinions.
C) With only two measures and no control group, almost none of the threats to internal validity are controlled.
D) With no control group, there is not enough variability in the experimental group to see an effect.
Answer: C
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