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Here is a detailed explanation to this question-
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The board of trustees, worried about the Neith corporation's rising debts, instructed Neith's CEO to not only downsize significantly, to lay off over 5000 employees around the country, but terminating as well the Neith's relationship with Arachne Unlimited, who in the past year were draining valuable funds from the Neith.
(A) to not only downsize significantly, to lay off over 5000 employees around the country, but terminating as well the Neith's relationship with Arachne Unlimited, who in the past year were
(B) to not only downsize significantly, to lay off over 5000 employees around the country, but also to terminate the Neith's relationship with Arachne Unlimited, which in the past year were
(C) not only to downsize significantly, to lay off over 5000 employees around the country, but also terminating the Neith's relationship with Arachne Unlimited, who in the past year was
(D) not only to downsize significantly, laying off over 5000 employees around the country, but also to terminate the Neith's relationship with Arachne Unlimited, which in the past year was
(E) not only to downsize significantly, laying off over 5000 employees around the country, but also terminating the Neith's relationship with Arachne Unlimited, who in the past year were
Choice A: Option A suffers from a number of errors, including two parallelism errors; "downsize" does not parallel "terminating" but does parallel "to lay off". However, as "to lay off over..." is a subordinate phrase its verb should not be parallel to the primary clause's. We can also see a subject-verb disagreement between "were" and "Arachne Unlimited. Additionally, "who" should not be used to refer to "Arachne Unlimited" as a company is a non-human entity. Thus, Option A is incorrect.
Choice B: Option B shares the first parallelism error, maintaining parallelism in a subordinate clause, and subject-verb agreement error of Option A. Thus, Option B is incorrect.
Choice C: Option C also suffers from the parallelism and subject-verb agreement errors found in Option A. Thus, Option C is incorrect.
Choice D: Option D maintains parallelism and subject-verb agreement throughout the sentence and is quite concise. Thus, Option D is correct.
Choice E: Option E repeats the subject-verb agreement error that Option A committed and fails to maintain parallelism between "to downsize" and "terminating". Thus, Option E is incorrect.
Hence, D is the best answer choice.To understand the concept of using "Which", Who, Whose, and Where on GMAT”, you may want to watch the following video (~1 minute):
To understand the concept of “Collective, Countable, and Uncountable Nouns on GMAT”, you may want to watch the following video (~2 minutes):
All the best!
Experts' Global Team