A university argues that its career counseling program increases graduate employment rates because 85% of students who completed the program were employed within six months. Which most weakens this argument?
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A
Career counseling programs exist at most universities.
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B
Only students who were already highly motivated and employable chose to complete the program, so their success reflects their prior attributes rather than the program's effectiveness.
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C
Six months is a standard benchmark for measuring graduate employment.
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D
The university's counseling staff holds relevant professional certifications.