GMAT Critical Reasoning (CR) | Re: Formal performance evaluations in the professional

Quite close between C & E...I go for C

Formal performance evaluations in the professional
world are conducted using realistic situations.
Physicians are allowed to consult medical texts freely,
attorneys may refer to law books and case records,
and physicists and engineers have their manuals at
hand for ready reference. Students, then, should
likewise have access to their textbooks whenever they
take examinations.

The reasoning in the argument is questionable
because the argument

(A) cites
...

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