The answer is C. Oh, and I found a resource to back it up:
The Federal Government, under the Attorney General (who was still being paid by the railroad industry), sent in Federal troops and US Marshalls to break the strike and get the trains moving again.
The answer should be A) .
A historian using the historical thinking skill of chronological thinking might put evens that took place in history in "chronological order" in the hopes of understanding why certain events took place after others. This helps the historian determine "cause and effect".
(A.) The assembly line was introduced during the industrial age when factory owners began to favor efficiency and standardization which saved a lot of money and made a lot of money.
B. Costs too much and takes more time, requires specialized workers.
C: Not as efficient as assembly line process.
D: There were no labor unions or laws, so workers were overworked and underpaid, this is just wrong.