Answer:
It marked a shift to mechanical equipment to make jobs easier and increase mass production.
Explanation:
A blistering agent that caused sevre burn and blisters on the skin
Well, the only one that actually makes sense to me is C.
C) Alexander Graham Bell
He said it into the first telephone of March 10, 1876
If it's wrong let me know and I'll help the best I can. Enjoy! (: