All of the following contributed to America's economic boom in the 1950s EXCEPT:
A) Aid from the GI Bill that helped veterans gain more education, buy homes, and start businesses with government-backed loans
B) The growth of the nation's automotive industry and the subsequent building of interstate highways
C) The adoption of code-processing computers that eliminated the need for many manual labor jobs in the nation's urban centers
D) The ample funds funnelled into the defense contracting industry