Cool Deal, a Soft-Drink Company Extended Its Brand Name to Include

Cool Deal, a soft-drink company extended its brand name to include soaps.Cool Deal did not succeed in selling its soaps and, as a result, sales of its core brand also declined.It took Cool Deal considerable effort to regain customers who had turned to other soft drinks.This is an example of:

A) cobranding.
B) brand equity.
C) brand licensing.
D) brand extension.
E) brand dilution.