Answer:
C) many times in the past several decades, firms may have chosen between a production method in the United States that uses fewer workers and more machines and a production method in China that uses more workers and fewer machines.
Step-by-step explanation:
American manufacturing jobs have been constantly decreasing for a little more than two decades now. Most people like to blame China and other countries for that decline, since they state that american production moved overseas. That statement is only partially true, but for the most part is false. The vast majority of American manufacturing jobs have been lost to automation.
Apple used to build computers in California, and it started assembling them again a few years ago, but the factories were completely automated. Some jobs are created, specially those related to maintenance and programming, but they aren't very many. Most large factories use more robots and less humans, and the tendency will only increase in favor of the robots in the future.