Diabetics often suffer dangerously low blood sugar levels, which they can correct safely if they notice the symptoms quickly. It has been suggested that diabetics should be advised to drink moderate amounts of coffee, since doing so improves their ability to recognize symptoms of low blood sugar quickly. That would be bad advice, however, since drinking even small amounts of coffee can increase the body's need for sugar in unpredictable ways.

In the argument being made, the part that is in boldface plays which of the following roles?

A) Presenting the conclusion toward which the argument as a whole is directed
B) Providing support for the conclusion of the argument
C) Offering a reason to take a course of action recommended in the argument
D) Stating the position to be refuted by the argument
E) Providing an instance of a general principle articulated in the argument
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Resource: GMATPrep RCs With Solution

I don't understand why answer choice C is wrong, experts please explain the reasoning on this CR question.

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