What was the author's main purpose in writing " the skinny on low-fat diets" by alan ling?

Low-fat diets are also a fad in the fitness industry. The hope of losing weight through cutting down the number of calories we intake by double-checking food labels and being conscious about this gives a whole new stigma to the dieting scene and in being skinny. Alan Ling's purpose was to re-orient the thinking of the masses and consume a balanced and nutritious meal over removing and limiting oneself from caloric consumption.

Not b or c so that leaves you with a or d. a is the better choice.