A Behavioral Economist, in Contrast to a Traditional Economist, Would

A behavioral economist, in contrast to a traditional economist, would argue that one reason people have a hard time losing weight is that:

A) people prefer to eat sweets and fatty foods and therefore are making an optimal choice.
B) the cost of losing weight (exercising and eating less) must be incurred now, whereas the benefit (being thinner) isn't enjoyed till later.
C) fatty and sweet foods cost more than healthy foods in general, and therefore people buy more sweet and fatty foods.
D) we live in a sedentary society with little opportunity for rigorous exercise.