What is one of the primary reasons for the growth of trucking after World War II? a. Trucks became larger and faster b. Shippers liked the door to door service which trucks could provide c. The Interstate Highway System was constructed which allowed trucks to give faster service over longer distances. d. The railroads gave up on truck type freight and stopped seeking it.

c. The Interstate Highway System was constructed which allowed trucks to give faster service over longer distances.

Explanation:  The Interstate Highway System, a 41,000 mile stretch of Highway roads was constructed  after an act, signed by President Eisenhower in 1956. This enhanced the trucking industry as it was the beginning of fast travelling,  trucks could go for longer distances without the hassle of traffic and long routes. The size and weight of trucks also meant that Highways were the more effective way for trucks to travel.

i am sure the answer is d