When Releasing Mango Madness,Snapple Asked Retailers to Put the New

When releasing Mango Madness,Snapple asked retailers to put the new drink right next to mangos in the fruit aisle.The incentive for supermarkets was free mangos for participating.This _____ resulted in Snapple selling a lot more Mango Madness a lot faster and for a lot less money than if the company had just placed ads in consumer magazines and on TV.

A) viral marketing program
B) direct marketing activity
C) sales promotion
D) publicity
E) advertorial