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GMATNinja
A question from the sentence correction "ask me anything" thread:

GKomoku
Hello again GMAT Ninja,

OGVR-2018 Book Question: 251

As a result of record low temperatures, the water pipes on the third floor froze, which caused the heads of the sprinkler system to burst, which released torrents of water into offices on the second floor.

A. which caused the heads of the sprinkler system to burst, which released torrents of water
B. which caused the heads of the sprinkler system to burst and which released torrents of water
C. which caused the heads of the sprinkler system to burst, torrents of water were then released
D. causing the heads of the sprinkler system to burst, then releasing torrents of water
E. causing the heads of the sprinkler system to burst and release torrents of water

I need your help again.
I understand why A, B and C are wrong.
My concern is between D and E. Gramatically both of them seem correst, but the meaning is different.
Per my understanding the release of water could not happen without pior burst of sprinkler system, no burst no water release, clear. And this sequesne is clearly indicated in the orginal sentence.

I'm struggling, could you please explain me why answer choice E is correct?
Thank you for your help,

Best regards, GKomoku
You might be overthinking the sequence just a little bit. Sure: technically speaking, the sprinkler bursts before the water is released. But in reality, don’t both things happen in the blink of an eye, and appear to be simultaneous?

More importantly, it seems completely reasonable for the two actions (“burst” and “release”) to be in a parallel structure. When the water pipes froze, it caused the heads of the sprinkler system to do two things: burst and release torrents of water. Seems OK to me, since both actions were caused by the freezing of the water pipes.

Here's the full sentence again, with (D) punched in:

Quote:
(D) As a result of record low temperatures, the water pipes on the third floor froze, causing the heads of the sprinkler system to burst, then releasing torrents of water into offices on the second floor.
So what’s wrong with (D)? The use of “releasing” is confusing and problematic. “Releasing” seems to be a modifier here (and no, it’s definitely NOT a verb; more on that issue in this article), but I can’t quite figure out what it’s modifying. It’s hard for me to understand how “then releasing torrents of water” could possibly modify or describe “causing the heads of the sprinkler system to burst."

(E) is much, much clearer, since it vividly describes the two consequences that occurred when the water pipes froze. So it's our winner.

I hope this helps!




Hello GmatNinja,
Can we skip A, B and C Because of wrong usage of which?
Please clarify on this.
Thanks.
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Sakshi_27
Hello GmatNinja,

Can we skip A, B and C Because of wrong usage of which?

Please clarify on this.

Thanks.
The "which" is definitely a problem, but knowing that "which" modifiers are a bit of a gray area on the GMAT, you probably want to look for other reasons to eliminate A, B, and C.

  • (C) is a run-on sentence, so that one's gone right away ("... the water pipes froze, torrents of water were then released...").
  • The parallel structure in (B) suggests that the freezing of the pipes is what released torrents of water. That might be true indirectly, but the freezing itself isn't what released the water.
  • In (A), we have not one but TWO "which" modifiers, and neither one clearly modifies a specific noun. Instead, both seem to modify the actions of the preceding clauses. Maybe that's not absolutely wrong, but at best it's more confusing than what we have in (E).
  • The use of a second "which" in (A) makes it sound as though the "bursting" is what released the water. That's not terrible, but really it's the sprinkler heads themselves that released the water. In other words, the "bursting" may have caused the sprinkler heads to release the water (as suggested by the parallel structure in E), but the "bursting" itself did not release the water.

Are (A), (B), and (C) absolutely WRONG because they violate iron-clad grammar rules? Probably not, but (E) is a much better choice.

In general, if you try to get through SC by memorizing tons of grammar "rules" and blindly applying them, you'll likely hit a plateau. GMAT SC is largely about meaning and logic, so unless the sentence violates a very clear grammar rule (like subject-verb agreement), you want to be conservative and consider other decision points.

I hope that helps!
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