Which of the Following Statements Regarding Billboards Is Most Accurate

Which of the following statements regarding billboards is most accurate?

A) Billboards are a good supplemental reinforcement for well-known products.
B) Contrary to popular belief, billboards are not driving hazards since they help keep drivers alert.
C) Billboards are well-suited for pioneering product advertising.
D) Billboards are often too expensive for small local firms and are better suited for national campaigns.
E) Billboards are more effective in rural areas than in metropolitan ones.