The bustling train station of Queen's Cross is located in the central business district (CBD) of Cunningham. It connects the CBD with all the major suburbs. Joan Harris takes the subway to work every day. She observes that a number of street musicians perform near the entrance of the station. She notices that although most of them appear to be pretty good at what they do, they don't seem to make much money. In order to determine the true value of the musicians' art, Joan and her friend decided to ask people how much they would be willing to pay to listen to this music. While most responses were positive, some people were hardly willing to pay any money to listen to these musicians play. However, considering that people tend to understate their actual willingness to pay in polls, Joan revised all the responses upward in order to get a more realistic estimate. Which of the following, if true, would suggest that Joan's final estimate does not accurately reflect the value of the music played by the street musicians?A. Joan polled commuters at different times of the day to ensure a representative sample. B. Those who are unwilling to pay actually do not want to listen to the music. C. Restrictions have been imposed on the volume of the music played by street musicians near the subway. D. The music industry in this country has been adversely affected by an increase in piracy. E. Most of the street musicians at Queen's Cross have been performing here for the past three months.