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Contrary to popular belief, video games aren‘t just for killing an idle Thursday evening, in fact, a variety of recent studies have begun to demonstrate their teaching potential.

A. video games aren‘t just for killing an idle Thursday evening, in fact, a variety
of recent studies have begun to demonstrate

B. video games aren‘t just to kill an idle Thursday evening, but a variety of
recent studies, in fact, have begun to demonstrate

C. video games aren‘t just for killing an idle Thursday evening; in fact, a variety
of recent studies has begun to demonstrate

D. video games aren‘t just for killing an idle Thursday evening; in fact, a
variety of recent studies have begun to demonstrate

E. video games aren‘t just for killing an idle Thursday evening, and a variety of
recent studies have begun in demonstration of
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I think it should be A....I'm confused as well, the second clause is dependent on the first one because of the pronoun "their"
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+1D

A comma cannot be used to link two independent clauses. We require a conjunction, full stop or a semi colon after "evening"

Eliminate option A, B and E

Plural "Studies' will take the verb have and not has

C. video games aren‘t just for killing an idle Thursday evening; in fact, a variety of recent studies has begun to demonstrate
D. video games aren‘t just for killing an idle Thursday evening; in fact, a variety of recent studies have begun to demonstrate

:-D
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I don't this is a valid question , because the difference between A and D is only the punctuation, GMAT would never differentiate between two sentences based JUST on punctuation.
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I don't this is a valid question , because the difference between A and D is only the punctuation, GMAT would never differentiate between two sentences based JUST on punctuation.

It's a normal and a less difficult question. Here we are just dealing with punctuation and subject verb errors, whereas other types of questions demands understanding of meaning as well.

In choice A, sentence is run on because we have not placed any proper coordinating conjunction. such error is not just a punctuation error in gmat world: it's serious crime.

I would say don't juxtapose A with D. Just assess whether A is acceptable as such or not. In D punctuation is smartly used to connect two ICs.

If you have just begin with SC then I say your perspective will change with time towards such question in coming days. This question is within limits of tested concepts in GMAT.

:yes
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Snippet from article published here https://online.wsj.com/public/resources/ ... S.0706.pdf.

The stylebook’s entry on collective nouns
advises that with words such as variety, number
and total, a rule of thumb is to use a singular
verb when the article the precedes the noun
and a plural verb when the article a is used.

Understand what mentioned above in conjunction with explanation by Adam in above comments.

A variety of bird is very popular (correct)
A variety of birds are in our building (correct)
The variety in languages is rare. (correct)

So there was something more left to learn besides "a number of".
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Isn't a "variety of studies" single?
It's not the same as a "number of studies"? or is it?
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ronr34
Isn't a "variety of studies" single?
It's not the same as a "number of studies"? or is it?

Yes, "Variety" similar to "bunch" and "a number" => A collection of distinct items.

"A number" is plural. "The number" is singular.
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Contrary to popular belief, video games aren‘t just for killing an idle Thursday evening, in fact, a variety of recent studies have begun to demonstrate their teaching potential.

A. video games aren‘t just for killing an idle Thursday evening, in fact, a variety of recent studies have begun to demonstrate - missing ";" before "infact" - which is corrected in option D
B. video games aren‘t just to kill an idle Thursday evening, but a variety of recent studies, in fact, have begun to demonstrate - "but .." "infact..." quite vague
C. video games aren‘t just for killing an idle Thursday evening; in fact, a variety of recent studies has begun to demonstrate - "has" does not agree with plural "games"
D. video games aren‘t just for killing an idle Thursday evening; in fact, a variety of recent studies have begun to demonstrate - CORRECT .. ";" introduced before "in fact" + "have" agrees with "games"
E. video games aren‘t just for killing an idle Thursday evening, and a variety of recent studies have begun in demonstration of - "demonstration" incorrect.. wordy sentence
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C. video games aren't just for killing an idle Thursday evening; in fact, a variety of recent studies has begun to demonstrate

D. video games aren't just for killing an idle Thursday evening; in fact, a variety of recent studies have begun to demonstrate


Shouldnt the answer be C?
Isn't 'a variety of recent studies' singular? (like a bunch of roses)
Can someone please clarify
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