The impact of the cotton gin on society is comparable to the impact of all of the following developments. EXCEPT :the assembly line,telegraph,sewing machine and application of steam power to factories.

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1.The impact of the cotton gin on society is comparable to the impact of all of the following developments. EXCEPT :the assembly line,telegraph,sewing machine and application of steam power to factories.
2.Which of the following was a direct effect of the invention of the cotton gin?

(A)  The invention of the steel plow
(B)  The spread of the plantation system into Northern states
(C)  The development of the Lowell factory system in New England
(D)  The introduction of the factory system in the South