Two Weeks Ago, Roger Replaced His Bad Habit of Eating

Two weeks ago, Roger replaced his bad habit of eating a candy bar every afternoon at work with eating a healthy snack. However, today was a particularly stressful day at work, and he relapsed and ate a candy bar. He is ready to give up, but you suggest he begin doing which of the following instead?

A) Punishing himself each time he relapses
B) Recording his progress and relapses in a chart
C) Allowing himself two days of relapse for every five successful days
D) Making himself throw up each time he eats a candy bar