Factors Contributing to the Rise of U

Factors contributing to the rise of U.S.freight railroads since about 1980 are

A) road congestion, concerns about pollution and noise, and development of the multi-modal container.
B) higher train speeds, development of more custom service by railroads, and concerns about terrorism.
C) increased shipments of high-value goods like computers, unreliability of air freight, and the building of new railroads.
D) All of the above
E) None of the above