Haya Noticed That College Students Needed to Dress Up for Presentations

Haya noticed that college students needed to dress up for presentations but never seemed to have any ties, or at least not very nice ones. She decided she was going to set up a tie store on her campus and offer sports themed ties as well as solid colored ties in her school colors. She started offering a "punch card" promotion -- buy three ties and get the fourth one for half off.
This "punch card" promotion is a form of

A) upselling
B) cross-selling
C) a loyalty program.
D) customer intimacy