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Sentence Correction: Parallelism - (n)either A (n)or B

Faced with the dubious victory over the Russian armies at Borodino, and with Moscow ablaze, Napoleon Bonaparte could choose to either pursue the Russians further and sacrifice the remainder of his troops to the harsh winter and possible starvation rather than retreat to France and face political humiliation. 

Incorrect.

This answer choice is grammatically incorrect. Either must be followed by or.

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Incorrect.

This answer choice is grammatically incorrectEither must be followed by or. Retreating (V+ing) and face (base form) violate the parallelism at the end of the sentence.

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Well done!

This answer choice corrects the Parallelism mistake in the original question by changing than to or, completing the either...or parallel construction.

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Incorrect.

While this answer choice corrects the Parallelism mistake in the original question by complementing either with or, it is illogical and changes the meaning of the original sentence.

In the original question, continuing to pursue (=chase after) the Russian army, would result in sacrificing the troops. This is implied by the parallelism to pursue...and sacrifice.

In the corrected sentence, sacrificing the remainder of his troops, etc. modifies the verb retreat. This means that to retreat (=go back), rather than pursue the Russians, would involve sacrificing the troops. This doesn't make sense, because the purpose of retreating is to save the army, not to sacrifice it.

Incorrect.

While this answer choice corrects the Parallelism mistake in the original question by complementing either with or, it is illogical and grammatically incorrect.

In the original question, the alternatives are to pursue the Russians and sacrifice the troops or (rather than) retreat.

In the corrected sentence, the alternatives are to pursue the Russians or sacrifice the troops.

In addition, by changing retreat to a retreat, the corrected sentence creates an incorrect parallelism at the end of the sentence: a retreat (noun) to France, and face (verb) political humiliation.

and sacrifice the remainder of his troops to the harsh winter and possible starvation rather than retreat
and sacrifice the remainder of his troops to the harsh winter and possible starvation rather than retreating
and sacrifice the remainder of his troops to the harsh winter and possible starvation or retreat
or sacrifice the remainder of his troops to the harsh winter and possible starvation and a retreat
or, sacrificing the remainder of his troops to the harsh winter and possible starvation, retreat