Ted Changed His Eating Habits to Lose Weight 2 Months

Ted changed his eating habits to lose weight 2 months ago. Yesterday, he bought a gallon of cherry ice cream because it was on sale and he needed a dessert to take to a family party next week, but then couldn't resist eating two bowls of it last night. Ted is very upset that he has "blown it" and reverted to his former overeating. What should he do now?

A) Forgive himself and avoid keeping ice cream in his freezer overnight in the future
B) Give up on his improved eating habits because relapses mean certain failure
C) Practice resisting temptation by keeping ice cream around and not eating it
D) Eat the rest of the ice cream quickly, and then resume healthful eating habits