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Sub 505 Level|   Parallelism|            
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sztiwari
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does anybody can explain why E is not correct?
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D for me
Parallel structure ... causing is || to making

Simplify to sentence :
A fire <does something>, making ignition much easier and causing flames to spread.

E is not correct because E is passive voice. In GMAT if an active sentence is always more correct than a passive one.

sztiwari
6.A fire in an enclosed space burns with the aid of reflected radiation that preheats the fuel, making ignition much easier and flames spreading more quickly.
(A) flames spreading
(B) flame spreads
(C) flames are caused to spread
(D) causing flames to spread
(E) causing spreading of the flames
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ksh013
does anybody can explain why E is not correct?

A fire in an enclosed space burns with the aid of reflected radiation that preheats the fuel, making ignition much easier and causing spreading of the flames more quickly.
I think such use is not logical - you can't say for sure to which part of the sentence 'more quickly' refers to. It should refer to the speed of spreading rather than to 'a fire' burning or 'making ignitions'...
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It looks like to me that letter (A) and letter (D) meet the parallelism rule.

With letter A ---->A fire <etc etc>, making ignition much easier and flames spreading more quickly.

With letter D ---->A fire <etc etc>, making ignition much easier and causing flames to spread more quickly.

In the first, ignition and flames spreading are parallel nouns; in the second, Making and causing are parallels. Is parallelism the real difference between those answer choices? Someone could explain better why it can't be letter A?

Thanks
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Do we need 'causing' and 'to cause' here?

ANS: Yes, its a verb (for C, D, and E), A is missing the verb

(A) flames spreading (missing verb)

(B) flame spreads (look at this, this good choice, only slight deviation -- flames --flame)... B is a good option less of choice here

(C) flames are caused to spread

(D) causing flames to spread

based on the original construction of C vs. D (D is better) -- even better than B (kept the flames --> flames)

(E) original E has 'causing'

what to follow cause (an infinitive or gerund) prefer infinitive)

Go for D
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Please suggest why B is incorrect .
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yashverman
Please suggest why B is incorrect .

Hello yashverman,

We hope this finds you well.

To answer your query, the intended meaning of the crucial part of this sentence is that reflected radiation preheats the fuel, and as a result makes ignition much easier and causes the flames to spread more quickly; here, the cause-effect relationship between preheating the fuel and the two subsequent actions is conveyed through the "comma + present participle ("verb+ing" - "making" and "causing" in this sentence); remember, the introduction of the present participle ("verb+ing") after comma generally leads to a cause-effect relationship

Option B fails to convey this cause-effect relationship fully; the phrase "and flame spreads" incorrectly implies that preheating the fuel and the flames spreading more quickly are separate actions.

To understand the concept of "Comma plus Present Participle for Cause-Effect Relationship" on GMAT, you may want to watch the following video (~3 minutes):



All the best!
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