Which innovation enabled ordinary people to buy cars? A. Joseph Pultizer's use of advertizing in newspapers B. Henry Ford's assembly line, which made cars inexpensive C. J.P.Morgan's methods of banking that made it easy to get credit D. Thomas Edison's use of electricity to keep factories open around the clock
It was "B. Henry Ford's assembly line, which made cars inexpensive" that did this, which was in fact one of Ford's main goals. The assembly line allowed people to focus on just one small part instead of many
