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BillyZ
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GMAT 1: 750 Q51 V40 (Online)
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19 Mar 2017, 07:54
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
49% (01:22) correct
51%
(01:31)
wrong
based on 2724
sessions
History
Date
Time
Result
Not Attempted Yet
While global temperatures have risen sharply over the last century, they have only recently eclipsed the Medieval period, during which scientists theorize that a series of volcanic eruptions sent the earth into a period of historic warmth.
A. they have only recently eclipsed the Medieval period, during which scientists theorize that a
B. they have only recently eclipsed those of the Medieval period, during which scientists theorize that a
C. it has only recently eclipsed the Medieval period, during which, scientists theorize, a
D. it has only recently eclipsed that of the Medieval period, during which scientists theorize a
E. they have only recently eclipsed those of the Medieval period, during which, scientists theorize, a
A. they have only recently eclipsed the Medieval period, during which scientists theorize that a
B. they have only recently eclipsed those of the Medieval period, during which scientists theorize that a
C. it has only recently eclipsed the Medieval period, during which, scientists theorize, a
D. it has only recently eclipsed that of the Medieval period, during which scientists theorize a
E. they have only recently eclipsed those of the Medieval period, during which, scientists theorize, a
19 Mar 2017, 13:35
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ziyuen
the main subject here is "temperatures", so we need a pronoun that refers to "temperatures" and most importantly agrees with the subject's number, so "they" in A, B and E correctly refers back to the main subject. Note: in option C and D the pronoun "it" logically refers to the noun "century", but then these options do not convey the right meaning (how can a century eclipse a period in time?), so options C and D are out.
Now let's look at options A, B and E
A -> "they" (temperatures) have only recently eclipsed the Medieval period. How can temperatures eclipse a period in time, doesn't make sense, technically a possessive pronoun is missing, so option A is out.
B -> we have the required possessive pronoun "those" but we see a meaning issue in this option, the part "during which scientists theorize" tells us that it was the Medieval period when the scientists theorized the explanation of the volcanic activity, this meaning is wrong, so option B is out
E-> the punctuation helps out in this option, this option correctly conveys the meaning that recently the scientists came up with a theory that during the medieval period the temperatures rose due to intense volcanic activity.
E wins!
BillyZ
Current Student
Joined: 14 Nov 2016
Last visit: 03 May 2025
Posts: 1,143
Given Kudos: 926
Location: Malaysia
Concentration: General Management, Strategy
Schools: Sloan '23 (D) Tuck '23 (D) Darden '23 (D) Ross '23 (D) Kellogg '23 (D) Wharton '23 (D) Booth '23 (D) Fuqua '24 (A) Harvard '24 (D) Stanford '24 (D)
GMAT 1: 750 Q51 V40 (Online)
GPA: 3.53
Products:
Schools: Sloan '23 (D) Tuck '23 (D) Darden '23 (D) Ross '23 (D) Kellogg '23 (D) Wharton '23 (D) Booth '23 (D) Fuqua '24 (A) Harvard '24 (D) Stanford '24 (D)
GMAT 1: 750 Q51 V40 (Online)
Posts: 1,143
22 Mar 2017, 18:57
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Bookmarks
ziyuen
OFFICIAL SOLUTION
Difficulty Level: 750-800
This problem provides two very clear decision points for you to get started:
1) "they" vs. "it" as the first word of the sentence
2) "that of" vs. "those of" vs. (no possessive) in relation to "the Medieval period"
The key to both of these is recognizing the subject of the sentence which is "global temperatures." Since temperatures is plural, the pronoun that corresponds to them must be "they" and you can eliminate choices C and D.
Then notice that the comparison is between current global temperatures and the temperatures during the Medieval period; you cannot logically compare "temperatures" with the timeframe, so you need to have "those of" (which B and D have but A does not) to properly draw the comparison.
Between A and E, notice that the only difference is commas around "during which." Why is that important? Here you're dealing with a tense/timeline decision. Since "theorize" is present-tense but the Medieval period is clearly in the past (even if you're not a historian, the fixed past tense "sent" outside the underline tells you that those volcanoes were in the past), you cannot have "scientists theorize" as part of the phrase "during which." The scientists currently theorize that volcanoes caused the global warming, so you need to separate that subject-verb from the modifier "during (the Medieval period)." This means that answer choice E is correct.
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