What Might Be Called a "Second or Post-Industrial Revolution," the "Roaring

What might be called a "second or post-Industrial Revolution," the "roaring economy"
Of the 1920s involved all the following EXCEPT

A) a productivity revolution based on technology.
B) a consumer-goods revolution.
C) a revolution in thinking, in which advertising persuaded consumers to buy now rather than save.
D) a revolution in labor relations, marked by new growth in the size and influence of labor unions.