Answer :
Answer:
D) Usage
Explanation:
Usage barriers or obstacles to use are basically reasons why a customer will cease purchasing a good or service, or might even return a purchased good just after purchasing it. Sometimes enthusiastic customers may falsely believe that a product is easy to handle and use, while it's not, e.g. a Sedgeway that initially had very high sales but then they plummeted. Usage barriers result in high customer churn.
In this case, some users might actually believe that eating a small amount for one day and exercising for a couple of hours will radically change their body structure. The bad thing is that after a few days they will realize that it was all a lie, and they will get either frustrated or mad.