For the answer to the question above.
The best answer I can give is letter B.
During the civil war, there was also a competition in the global market on the supply of cotton so Europe sought other suppliers from India and Egypt and this is why the price is down after 1865
The diaphragm is the part that adjusts the light of the specimen
Provided a useful way to turn iron into steel, British manufacturer who the Bessemer Process was named.
