Darren Loves to Go to the Movies,and He Just Learned

Darren loves to go to the movies,and he just learned that he can buy a ticket at a discounted price using his student ID.Darren now attends movies even more often.The change in Darren's behavior would be shown graphically by a:

A) rightward shift in his demand curve.
B) leftward shift in his demand curve.
C) movement down along his demand curve.
D) movement up along his demand curve.