Which of the Following Statements Is True

Which of the following statements is true?

A) By the 1950s almost all of the land within the legal boundaries of the northern and eastern parts of the U.S. had been developed.
B) Beginning in the 1980s, the federal government began building a system of interstate highways linking suburbia with the central cities.
C) Suburban housing costs were higher in the 1950s than central city housing costs.
D) Demographics had little to do with the suburban boom of the 1950s.