What Will Make the Product Testing and Test Marketing Stage

What will make the product testing and test marketing stage challenging for an online product such as ComicalYou?

A) Putting a software service on a Web site is very expensive.
B) Consumers are reluctant to try out new forms of social media.
C) Research and development is expensive, and many new products fail.
D) If word about the service spreads quickly, it will be difficult to confine the testing to a limited market.
E) If users in the test market are dissatisfied, it will be difficult to change the product after it is online.