Which of the Following Statements Is Inaccurate with Respect to Trading

Which of the following statements is inaccurate with respect to trading areas?

A) Trading areas are the most logical control units because they are based largely on the natural flow of goods and services rather than political or economic boundaries
B) A trading area is a geographical region that includes a city plus the surrounding area that serves as a retail or wholesale center
C) Use of trading areas aids sales management in planning and control in that the same salesperson usually calls on wholesalers in a trading area
D) There is an abundance of statistical data on trading areas; thus they are much preferred to counties or states as geographic control units