Question ID:PT44 S4 Q6 Passage:Doctors urge people to reduce their cholesterol levels through dietary changes. But moderate dietary changes often do not work to lower cholesterol levels. One may need, therefore, to make more dramatic changes, such as switching to a vegetarian diet. Stem:The statement that moderate dietary changes often do not work to lower cholesterol levels plays which one of the following roles in the argument? Correct Answer Choice:CChoice A:It is presented to counter doctors' suggestions that cholesterol levels can be reduced through dietary changes. Choice B:It is a premise offered in support of the claim that vegetarian diets are more healthful than any diets containing meat. Choice C:It is a premise offered in support of the claim that reducing cholesterol levels may require greater than moderate dietary changes. Choice D:It is offered as an explanation of the success of vegetarian diets in reducing cholesterol levels. Choice E:It is a conclusion for which the claim that dramatic changes in one's diet are sometimes required to reduce cholesterol levels is offered as support.