All of the Following Are Examples of Product Differentiation,except One

Multiple Choice

All of the following are examples of product differentiation,except one.Which of the following is the exception?

A) developing a new video game or a computer program called "How to Teach Your New Dog Old Tricks"
B) manufacturing a car that minimizes outside noise more than other cars do
C) lowering the price of a good for a special sale
D) providing movies and special meals on airline flights
E) making sodium-free, caffeine-free colas