What brought an increase in income and growth in the gnp for the united states during the twenties? (points : 3) industrialization and technology longer hours foreign credit low unemployment

Industrialization and technology brought an increase and growth in the GNP in the United States during the 1920's. The 1920's is now considered as the first modern decade in the U.S. During this time, automobiles became a choice for travel, this helped people to get to other jobs without relying on the trains or trolleys that did not go everywhere. The demand for trucks and cars helped to get the roadways improved and suburbs began to increase in size. Electricity was in high demand and this brought the new appliances, lights, and heating and air for homes. Businesses grew from people going out more and movies theaters and professional sports grew into huge profits for their owners.  The correct answer is A.