Which of the Following Statements Describes a Demographic Factor That

Which of the following statements describes a demographic factor that is likely to affect the marketing of homes in retirement communities?

A) Congress amended the Consumer Credit Protection Act.
B) Interest rates for homebuyers are below 10 percent.
C) Concern about water and air pollution has increased.
D) More than one-quarter of the U.S. population is at least 50 years old.
E) People are more willing to pay for convenience.