Which concept best explains the behaviour of a person who believes she has cheated on a diet,and then proceeds to go on an eating binge because they've already blown the diet anyway

A)  genetic predisposition 
B)  reaction range 
C)  set point 
D)  dietary restraint

This behavior is best explained by the concept of dietary restraint, which suggests that individuals who attempt to restrict their food intake for weight loss purposes may be more likely to engage in overeating or binge-eating behaviors when they believe they have "broken" their diet. This is because the restriction mindset can lead to a cycle of guilt and loss of control around food.