Question

Which of the following products has rapidly advanced due to the nature of the U.S. patent system?
A. Cleaning supplies
B. Dog food
C. Electric cars
D. Smart phones

Answer 1

i would say D. smart phones

Answer 2

The answer is: D. Smart phones

Because if the U.S patent system, other companies cannot copy the invention of others and sold the same product in the market.

This make a lot of those companies invested in research and development team to come up with new invention in order to compete in the market. This cause the product to advance rapidly.