Mark Often Comes to School Wearing Sandals Instead of Sneakers

Mark often comes to school wearing sandals instead of sneakers on days that he has physical education.He is getting angry with himself regarding his chronic forgetfulness about appropriate footwear.His teacher suggests that he treat himself to an hour of television only on days when he has remembered to wear sneakers.Mark's teacher is suggesting that Mark use:

A) vicarious reinforcement.
B) intermittent reinforcement.
C) a self-imposed contingency.
D) self-monitoring.