Which of the Following Statements Is False

Multiple Choice

Which of the following statements is false?

A) Congress has granted the U.S.Postal Service the exclusive franchise to deliver first-class mail.
B) A natural monopoly exists where economies of scale are so pronounced in an industry that only one firm can survive.
C) In the United States patents are granted for a period of 10 years.
D) A public franchise is a right granted to a firm by government that permits the firm to provide a particular good or service and excludes all others from doing the same.