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Bunuel
Characterizing the various eras of the comic book industry is quite a complicated thing to do and involves identifying the dominant trends in each era, such as naturalistic stories in the Silver Age.


A. is quite a complicated thing to do and involves

B. is quite a complicated thing to do and involve

C. are quite a complicated thing to do and involve

D. are quite a complicated thing to do and involves

E. is quite complicated and involves



OFFICIAL EXPLANATION



Characterizing the various eras of the comic book industry is quite a complicated thing to do and involves identifying the dominant trends in each era, such as naturalistic stories in the Silver Age.


A. is quite a complicated thing to do and involves

While this answer choice is grammatically correct, it is not the best of the five answer choices. There is another grammatically correct answer choice which is stylistically better than this one.


B. is quite a complicated thing to do and involve

This answer choice is grammatically incorrect. The singular subject Characterizing does not agree with the plural verb involve.

Remember that a subject in the form of Verb+ing is considered a singular subject.

The following Stop Signs help us identify this question as a Subject Verb Agreement question and detect this mistake:

    - A subject in the form of Verb+ing or To Verb

    - A long complex subject / long distance between subject and verb



C. are quite a complicated thing to do and involve

This answer choice is grammatically incorrect. The singular subject Characterizing does not agree with the plural verbs are, involve.

Remember that a subject in the form of Verb+ing is considered a singular subject.



D. are quite a complicated thing to do and involves

This answer choice is grammatically incorrect. The singular subject Characterizing does not agree with the plural verb are.


E. is quite complicated and involves

While the original sentence is grammatically correct, this answer choice improves on it by discarding the redundant phrase "thing to do". The presence of the phrase, while grammatically correct, is not necessary - the sentence works quite well without it (Characterizing...is complicated).

In a choice between two answer choices which are grammatically and logically correct, the one with the better style wins. The more concise manner of expressing the same idea is considered better style.
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