At the My M&M's Web Site,customers Can Design Their Own

At the My M&M's Web site,customers can design their own versions of the famous candy.Customers choose from 25 M&M'S colors;write a message,add clip-art,or even a face to each M&M,and select specific packaging.This is an example of:

A) a cooperative service
B) mass customization
C) aggregated standardization
D) a market development strategy
E) mental stimulus processing