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Here is a detailed explanation to this question-
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Studying skeletons unearthed near Rome, DNA evidence was recovered by scientists, who were able to deduce from this that an epidemic of malaria struck in the empire’s waning days.
(A) Studying skeletons unearthed near Rome, DNA evidence was recovered by scientists, who were able to deduce from this
(B) In studying skeletons unearthed near Rome, DNA evidence was recovered by scientists, who were able to deduce from this
(C) Scientists recovered DNA evidence from studying skeletons unearthed near Rome, being able to deduce from this
(D) Skeletons unearthed near Rome allowed scientists to recover DNA evidence, and they were able to deduce from it
(E) Scientists studying skeletons unearthed near Rome recovered DNA evidence from which they were able to deduce
Meaning is crucial to solving this problem:Understanding the intended meaning is key to solving this question; the intended meaning of this sentence is that scientists who were studying skeletons unearthed near Rome recovered DNA evidence, and from this evidence, they were able to deduce that an epidemic of malaria struck in the empire’s waning days.
Concepts tested here: Meaning + Modifiers + Pronouns + Awkwardness/Redundancy• In a “phrase + comma + noun” construction, the phrase must correctly modify the noun; this is one of the most frequently tested concepts on GMAT sentence correction.
A:1/ This answer choice incorrectly uses "Studying skeletons unearthed near Rome" to modify "DNA evidence", illogically implying that
the DNA evidence was studying the skeletons; the intended meaning is that
the scientists were studying the skeletons; remember, in a “phrase + comma + noun” construction, the phrase must correctly modify the noun.
2/ Option A suffers from pronoun ambiguity, as it is unclear whether "this" refers to "DNA evidence" or to the act of unearthing the DNA evidence, as a placeholder pronoun.
B:1/ This answer choice incorrectly uses "In studying skeletons unearthed near Rome" to modify "DNA evidence", illogically implying that
the DNA evidence was studying the skeletons; the intended meaning is that
the scientists were studying the skeletons; remember, in a “phrase + comma + noun” construction, the phrase must correctly modify the noun.
2/ Option B suffers from pronoun ambiguity, as it is unclear whether "this" refers to "DNA evidence" or to the act of unearthing the DNA evidence, as a placeholder pronoun.
C:1/ This answer choice suffers from pronoun ambiguity, as it is unclear whether "this" refers to "DNA evidence" or to the act of unearthing the DNA evidence, as a placeholder pronoun.
2/ Option C uses the passive phrase "being able to deduce", leading to awkwardness and redundancy.
D:1/ This answer choice slightly alters the meaning of the sentence through the clause "Skeletons...allowed scientists to recover DNA evidence"; the construction of this clause implies that because of the skeletons scientists were able to recover DNA evidence; the intended meaning is that scientists
who were studying the skeletons discovered DNA evidence.
2/ Option D uses the needlessly indirect construction "and they were able to deduce from it", rendering it awkward and needlessly indirect.
E: Correct.1/ This answer choice avoids the meaning errors seen in Options A,B, and D, as it uses the clause "Scientists studying skeletons unearthed near Rome recovered DNA evidence"; the modification of "Scientists" with the phrase "studying skeletons" and the construction of this clause conveys the intended meaning - that
scientists who
were studying the skeletons discovered DNA evidence.
2/ Option E avoids the pronoun error seen in Options A, B, and C, as it modifies the noun "DNA evidence" with the phrase "from which they were able to deduce", clearly referring to "DNA evidence" with the pronoun "which".
3/ Option E is free of any awkwardness or redundancy.
Hence, E is the best answer choice.To understand the concept of "Phrase Comma Subject" and "Subject Comma Phrase" on GMAT, you may want to watch the following video (~1 minute):
All the best!
Experts' Global Team