Which statement is the point in the group of sentences below?
a. Water and nine potatoes a day is all dieters are allowed on the "potato diet."
b. In their quest to lose weight, people have come up with some strange diets.
c. A once-popular diet forced dieters to eat only hard-boiled eggs.
d. An unusual diet was created that allowed dieters to eat all they want - but only of foods they hate.