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subh2273
During its early years, Ford Motor Company produced just a few cars with groups of two or three men working on each car, but within a decade the company would lead the world in the expansion and refinement of the assembly line concept, which made use of in-house part production and vertical integration.


A. but within a decade the company led the world in the expansion and refinement of the assembly line concept, which made use of in-house part production and vertical integration
Parallelism is ok, which refers correctly to the precedent. Hold this for now


B. but within a decade the company led the world in the expansion and refinement of the assembly line concept, and was making use of in-house part production and vertical integration
Comma-> and was -> I like which better.


C. but within a decade the company had led the world in the expansion and refinement of the assembly line concept, and was making use of in-house part production and vertical integration
Same as B

D. but within a decade the company would lead the world in the expansion and refinement of the assembly line concept, which made use of in-house part production and vertical integration
It sounds okay, but remember that would indicates conditional. It is not uncertain that Ford led the expansion... a few years later. Hence D is wrong.

E. but within a decade the company had led the world in the expansion and refinement of the assembly line concept, making use of in-house part production and vertical integration
Incorrect use of double past. Thus had led is wrong.
Answer is A, see above comments.

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