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Re: The invention of the cotton gin, being one of the most [#permalink]
19 Jun 2013, 22:24
This is from MGMAT and the OA is D and not B.
OA is D because -
If we pick D and say B for discussion sake then, having been one of the most significant developments of the nineteenth century, turned cotton cloth into an affordable commodity even though it had previously been expensive - Tries to state that since it was a significant development, it could make the cotton cloth an affordable commodity. The reason why the cotton cloth became affordable is not mentioned in the question.
In D, the sentence clearly puts the modifier as non-essential. The modifier probably modifies "invention of the cotton gin" rather than cotton gin itself. cotton gin is within a prepositional phrase "of the cotton gin".
So, D says that the invention of the cotton gin, <modifier>, <rest of the sentence>.
Another example -
It was only after Katharine Graham became publisher of The Washington Post in 1963 that it moved into the first rank of American newspapers, and it was under her command that the paper won high praise for its unrelenting reporting of the Watergate scandal.