The answer is A. Drove production costs up. It drove production costs down, because they were able to take less time to make the products as well as less materials because 1) standardized parts were invented around the same time, and 2) they didn't have people preparing everything so materials weren't wasted.
I think that the answer is D
The answer is b and i guess i need 20 words
preservation of the environment i just took the test
