A new low-carb diet claims to be the most effective way to lose weight quickly. A spokesperson for the diet attributes its success to its unique restriction of carbohydrates, forcing the body to burn fat. The spokesperson's argument relies on which of the following assumptions?

The correct answer to the question "A new low-carb diet claims to be the most effective way to lose weight quickly. A spokesperson for the diet attributes its success to its unique restriction of carbohydrates, forcing the body to burn fat. The spokesperson's argument relies on which of the following assumptions?" is Option C: The body's ability to burn fat is directly and positively correlated with weight loss..

The other options — A) Other diets do not restrict carbohydrates as effectively as this new diet., B) Rapid weight loss is the primary goal for everyone attempting to lose weight., D) All individuals respond to carbohydrate restriction in the same way. — are incorrect for this GMAT Exam Prep question. As explained above: The argument attributes weight loss success to forcing the body to burn fat. For this mechanism to lead to the stated outcome (weight loss), it must be assumed that burning fat is indeed an effective…