Answer: C An indifferent employee treated them poorly
Explanation:
One can clearly see that for the store to have retained patronage shows that the store do not need advertisement neither is price a factor. A firm (store) competitive advantage is in customer's perception of its products and services. If they are viewed to be good, they will get patronage. If customers are treated poorly, they will most likely switch to the next available outlet. A classical case of "customer is king".