GMAT Critical Reasoning (CR) | Re: Neuroscientists are making progress in discovering more

IMHO (D) with this one

(C) The procedure that allows scientists to discoverthe presence of protein deposits during an autopsy is not yet refined enough to ensure detection of the lesions in all patients.
Shifts focus to detection of the lesions in all patients rather than patients suffering from Alzheimer and elderly patients

(D) Autopsies have shown that some people lack the chemical necessary for protein deposits to cause brain lesions.

It
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