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energetics
According to the controversial theories of Stephen Hawking, some assumptions made by astronomers may need to be altered; although scientists had understood black holes to swallow everything and release nothing, to Hawking the unavoidable conclusion appears to be one where black holes emitting energy in the form of radiation.

A) unavoidable conclusion appears to be one where black holes emitting energy in the form of radiation
B) conclusion that black holes emits energy in the form of radiation seems entirely unavoidable
C) conclusion appears unavoidable that black holes emit energy in the form of radiation
D) conclusion of black holes having emitted energy in the form of radiation appears to be unavoidable
E) apparently unavoidable conclusion appears to be one where black holes emit energy in the form of radiation

What is the source of this question?

Please specify.

Thanks

Posted from my mobile device

It is from Princeton Review as mentioned in the tag.
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According to the controversial theories of Stephen Hawking, some assumptions made by astronomers may need to be altered; although scientists had understood black holes to swallow everything and release nothing, to Hawking the unavoidable conclusion appears to be one where black holes emitting energy in the form of radiation.

A) unavoidable conclusion appears to be one where black holes emitting energy in the form of radiation
where must be an actual physical location, a place. Although black holes have location, where modifies one and one refers to "unavoidable conclusion." A conclusion is not a place.
emitting is not a working verb. The second sentence is a fragment.


B) conclusion that black holes emits energy in the form of radiation seems entirely unavoidable
• subject and verb disagree

C) conclusion appears unavoidable that black holes emit energy in the form of radiation
• Correct: X appears Y
-- She appears disoriented. (She SEEMS disoriented.)
-- He appears worried [that he might have forgotten his passport]. (He seems worried that...)

• this language sounds a bit stilted, but it's fine. Black holes are supposed to swallow everything and release (emit) nothing. It appears to Hawking that we cannot avoid the conclusion that black holes do release something: they emit energy in the form of radiation.
[Hawking was correct. Supermassive Black Holes Give Birth to Stars, Astronomers Discover, here.
]

D) conclusion of black holes having emitted energy in the form of radiation appears to be unavoidable
• conclusion of means "end of." The correct phrase is conclusion that.
conclusion of black holes sounds like "the end of black holes."
• no reason exists to use having emitted. We are not discussing some unspecified time before now; black holes always do what they do. Use the present tense. The correct verb is emit.


E) apparently unavoidable conclusion appears to be one where black holes emit energy in the form of radiation
where: same problem as that in A
• redundancy
apparently means either "from appearances" (we already have appears) or "unmistakably" (we already have unavoidable)
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Good question
IMO C;

A) unavoidable conclusion appears to be one where black holes emitting energy in the form of radiation ; appears and emitting not ll ..
B) conclusion that black holes emitsenergy in the form of radiation seems entirely unavoidable ; black holes is plural ; emits verb is singular
C) conclusion appears unavoidable that black holes emit energy in the form of radiation ; correct sentence meaning remains intact
D) conclusion of black holes having emitted energy in the form of radiation appears to be unavoidable ; verb-ing error there is no llism of verbs with appears..
E) apparently unavoidable conclusion appears to be one where black holes emit energy in the form of radiation[/quote] ; meaning is distorted


energetics
According to the controversial theories of Stephen Hawking, some assumptions made by astronomers may need to be altered; although scientists had understood black holes to swallow everything and release nothing, to Hawking the unavoidable conclusion appears to be one where black holes emitting energy in the form of radiation.

A) unavoidable conclusion appears to be one where black holes emitting energy in the form of radiation
B) conclusion that black holes emits energy in the form of radiation seems entirely unavoidable
C) conclusion appears unavoidable that black holes emit energy in the form of radiation
D) conclusion of black holes having emitted energy in the form of radiation appears to be unavoidable
E) apparently unavoidable conclusion appears to be one where black holes emit energy in the form of radiation
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" appear that" exist only in the pattern
it appears that+clause
it is fake subject

real subject can not be
real subject appear that+that clause/
this is wrong idiomatically
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OE:

The underlined portion of the sentence contains the verbs appears and emitting, so check for parallel construction errors. The underlined portion of the sentence also contains the word where, so check whether it describes a location. The present tense verb appears is not parallel to the participle form emitting, so this is a parallel construction error. The word where describes the conclusion, which is not a place, so this is a where vs. which error. Eliminate choice A and look for any obvious repeaters. Choice E is an obvious repeater because it also uses where to describe the conclusion, so eliminate choice E. Now, evaluate the remaining answer choices individually, looking for reasons to eliminate each.

Choice B fixes both original errors but introduces a subject-verb agreement error since the plural subject holes does not agree with the singular verb emits, so eliminate choice B. Choice C fixes both original errors by removing where and replacing emitting with the present tense verb emits, and introduces no new errors, so keep choice C. For choice D, the verb having emitted is not parallel to appears, so eliminate choice D for a parallel construction error.

Choice A: No. The participle emitting is not parallel to appears. Where incorrectly refers to conclusion. Parallel Construction; Where vs. Which.

Choice B: No. The plural noun holes does not agree with the singular verb emits. Subject-Verb agreement.

Choice C: Correct.

Choice D: No. The verb having emitted is not parallel to appears. Parallel construction.

Choice E: No. Where incorrectly refers to conclusion. Where vs. Which.

The correct answer is choice C.
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energetics
According to the controversial theories of Stephen Hawking, some assumptions made by astronomers may need to be altered; although scientists had understood black holes to swallow everything and release nothing, to Hawking the unavoidable conclusion appears to be one where black holes emitting energy in the form of radiation.

A) unavoidable conclusion appears to be one where black holes emitting energy in the form of radiation
B) conclusion that black holes emits energy in the form of radiation seems entirely unavoidable
C) conclusion appears unavoidable that black holes emit energy in the form of radiation
D) conclusion of black holes having emitted energy in the form of radiation appears to be unavoidable
E) apparently unavoidable conclusion appears to be one where black holes emit energy in the form of radiation

(C) is the correct answer.

In (A) and (E), the usage of 'one' is awkward to say the least, and the usage of 'where' to indicate a phenomenon is definitely incorrect on the GMAT (something along the lines of 'in which' would have been better).

(B) has a Subject-Verb discord -- "Black holes" is plural, so the verb should be the in the plural form, i.e., "emit". Also, the construction "the conclusion that" seems to indicate that there is something about this specific conclusion mentioned previously in the sentence, which is not the case.

(D) makes it sound as if the conclusion is about "black holes", rather than an entire phenomenon. Incorrect.

For all these reasons, (C) is the best choice by far.
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energetics
According to the controversial theories of Stephen Hawking, some assumptions made by astronomers may need to be altered; although scientists had understood black holes to swallow everything and release nothing, to Hawking the unavoidable conclusion appears to be one where black holes emitting energy in the form of radiation.

A) unavoidable conclusion appears to be one where black holes emitting energy in the form of radiation
B) conclusion that black holes emits energy in the form of radiation seems entirely unavoidable
C) conclusion appears unavoidable that black holes emit energy in the form of radiation
D) conclusion of black holes having emitted energy in the form of radiation appears to be unavoidable
E) apparently unavoidable conclusion appears to be one where black holes emit energy in the form of radiation

A contains continuous form ‘emitting’ which is incorrect
B contains ‘emits’ instead of emit (for black holes - plural)
D contains ‘having emitted’ which is incorrect
E contains both ‘apparently’ and ‘appears’ which leads to redundancy
So A, B, D and E out.
Hence C.

Hope it helps :)
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