Manny Wants His Son to Be a Nonsmoker, So He

Manny wants his son to be a nonsmoker, so he discusses the dangers of smoking and explicitly tells his son not to smoke. If Manny is a smoker, his anti-smoking campaign will ______.

A) require more explicit demands to be effective
B) be less effective than if he was a nonsmoker
C) will require more monitoring than if he was a nonsmoker
D) be about as effective as if he was a nonsmoker