Answer: C. People are rational.
Step-by-step explanation:
Economic theory assumes that people are rational when making economic decisions. This means that they will seek to make a decision that can satisfy them the most or give them the highest benefit.
This benefit does not always have to be monetary, it can also be emotional. The U.S. customers who prefer made in America products would therefore be emotionally satisfied by the decision of these manufacturing companies to move back to the U.S. and will patronize them more.
This decision to move back was therefore based on people being rational.