Sharon Knows That Kathy Frequently Completes Her Assignments Long After

Sharon knows that Kathy frequently completes her assignments long after they are due. She has noticed that their teacher willingly accepts Kathy's late assignments because Kathy always has a creative excuse for turning them in late. Sharon begins to do the same thing-she turns in assignments past the due date and makes up excuses for why she is late. Sharon's increase in excuse-making is due to:

A) Shaping and intrinsic reinforcement
B) An increase in self-reinforcement
C) A decrease in self-regulation
D) Modeling and vicarious reinforcement