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The analyst didn’t consider the company’s charitable donations, its volunteer project expenses, nor the ways one affects the other.
(A) nor the ways one affects the other.
(B) nor how each was affected by some other.
(C) or the way where one affects the next.
(D) or the ways in which they affect one another.
(E) or the ways that each affect some other.
OFFICIAL EXPLANATION:
(Quantity Word) Remember that the phrase “each other” must be used when referring to two persons or things. Whenever the number involved is more than two, the correct phrase to be used is “one another.”
The non-underlined part of the sentence talks of the company’s “donations” and “expenses,” implying more than a single donation and expense. So, the use of the phrase “each other” to refer to them is ungrammatical and (A) is wrong.
(B) and (E) also contain the same error, and can be discarded for that reason alone.
Though (C) is shorter than (D), it has the error of using the conjunction “where” (which should be used only to refer to a place) to refer to “way” (meaning “manner” in the given context). Moreover, it is not intention of the author that every donation must be compared only to the “next” not to all. So, (C) is wrong.
(D) has no error, completes a clear, cogent, unambiguous and grammatical sentence, and is the answer.