Major retailers are suffering because e-commerce companies began to offer individuals one-day shipping on purchases,
despite the fact that they previously had offered standard shipping that could take several days or weeks for delivery.
A. despite the fact that they previously had offered
B. in spite of the fact previously that these companies offered
C. whereas previously they were offering
D. whereas previously there were those companies that offered
E. whereas previously these companies had offered
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Eliminate A / B because of "despite" / "in spite of". These phrase signifies some contradictions between two clauses - it makes sense that competitors moving from several days to same day delivery would hurt retailers. No contradiction here.
Eliminate C because the antecedent of "they" is unclear - is it major retailers, or e-commerce companies?
Eliminate D because "those companies" sounds like they are not referring to the same companies mentioned previously.
E is the answer. Whereas clearly joins the two clauses together, and repeating the noun makes the subject of the second clause unambiguous.
Worthy to note in E - "had offered" is the correct tense to use, meaning to offer before they "began to offer".
However, the "previously" in the sentence already clearly establishes the sequence of event, making "offered" a better choice.
(If you remove "previously" or "had" from the sentence, the meaning remains the same. It is redundent, but not a deal breaker.)
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