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Bunuel

It turns out that this question is not in OG10. Kindly consider removing the OG10 tag.

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can't "allergy to meat" also function as an object of the verb "believe"? Using "allergy to meat" as an object, the sentence would essentially say "Scientists believe allergy to meat to be turning into an epidemic" (Scientists believe X to be Y). Interpreted this way, the sentence has not a grammatical issue but a meaning issue i.e., how can scientists believe an allergy to be something?

In summary, is it fair to say that we should not eliminate answer choice (A) for the reason that it lacks a verb?

A: an allergy that scientists believe to be

This construction is grammatically valid.
Analogous examples from the web:
items that experts believe to be most important
a wasting syndrome epidemic that scientists believe to be the largest marine wildlife disease event in history
behaviors that psychologists believe to be expressions of a given trait
The issue in A is not grammatical but semantic.

The idiom here is X believes Y to be Z.
In each of the web examples above, the blue portion -- Z -- expresses what is thought to be a GENERAL TRUTH.
A general truth is a statement that is true not at a particular moment but that is ALWAYS true.
Generally:
When this idiom is properly used, the Z-portion should be something thought to be a general truth.

Back to option A:
an allergy that scientists believe to be turning into an epidemic
The full verb in the red portion is not to be but to be TURNING.
to be turning is not a general truth.
Quite the opposite: this construction expresses a TEMPORARY action that is happening RIGHT NOW.
Since the Z-portion in A is not something thought to be a general truth, the idiom X believes Y to be Z seems misused.
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Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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