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A clinic claims its new diet works because patients who followed it lost weight. Which, if true, most strengthens the claim that the diet caused the loss?
APatients found the diet tasty
BPatients liked the clinic's staff
CA comparable group not on the diet lost no weight over the same period
DLosing weight is good for health
Answer & Solution
Correct answer: C. A comparable group not on the diet lost no weight over the same period
A control group that did not lose weight isolates the diet as the cause, strengthening the causal claim.
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