​Some People Manage to Lose Weight and Keep It Off

​Some people manage to lose weight and keep it off after entering a diet program.However,other people enter one diet program after another and fail on each.What is a result of all this?

A) The prevalence of obesity increases from one generation to the next.
B) ​The statistics underestimate the percentage of people who benefit.
C) ​Weight-loss pills are more effective than behaviorally based plans.
D) ​Most people wishing to diet select the same diet program.