I really don't understand why C can't be an answer.
McKinley said the drug will have various effects on the patients' bodies. But he also said it will make us aware of "whether the patients are getting the drugs or a placebo" (Does it mean McKinley thought the placebo will produce no effects just like answer choice C?). So that's why I thought Engle said Mckinley assumed what the outcome of the study will be since McKinley said various effects of the drug AND whether the patients are getting the drugs or a placebo.
So can C be an answer?
Can anyone explain me why C can't be an answer and D is better?
Thanks!
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http://7sage.com/lsat_explanations/lsat-28-section-1-question-25/