On the Starbucks Home Page, There Is a Box That

On the Starbucks home page, there is a box that you can click on to go to buy a "game that keeps your brain working" from Cranium. Cranium pays Starbucks a commission each time it sells a game as a result of someone using the Starbucks site to get to the Cranium page. This is an example of a(n) :

A) affiliate promotion.
B) portal arrangement.
C) interconnect.
D) sponsorship.
E) linked promotion.