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GMAT Sentence Correction: Do You Got What It Takes?

Below is a question that is both good news and bad news if you see one like it test day. First off, you are doing very well to see such a difficult question, because of the computer-adapted nature of the test. The bad news: you might burn up a lot of time and not even answer it correctly.

So set your timer to two minutes and see if you can choose the correct answer. I’ll have the explanation up in a few days, but would love to see explanations from any of the intrepid ones out there (you can leave those in the comments section).
 

Question

In the middle of the 19th century, mathematician turned computer scientist Ada Lovelace aided Charles Babbage by developing the first computer algorithm, a breakthrough that ushered in the computer age, leading to machines capable of executing functions far more rapidly than could any possible human and resulting in every subsequent development in the field, from the development of the very first personal computer nearly a century later to the programs that today sequence genomes.

(A) mathematician turned computer scientist Ada Lovelace aided Charles Babbage by developing the first computer algorithm, a breakthrough that ushered in

(B) Ada Lovelace, mathematician and computer scientist, aided Charles Babbage by developing the first computer algorithm, ushering in

(C) Ada Lovelace, who was a mathematician turned computer scientist, aided Charles Babbage in developing the first computer algorithm, which ushered in

(D) the mathematician turned computer scientist, Ada Lovelace, aided Charles Babbage in developing the first computer algorithm; she ushered in

(E) Ada Lovelace, the mathematician turned computer scientist, aided Charles Babbage by developing the first computer algorithm, ushering in

 
Check back on Wednesday for the answer and explanation!

 

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