Hi ran787, not sure if you read my post just above yours.

B uses for thwarting, whereas to thwart is preferable when intent needs to be depicted.

Also, B uses a comma before since, distorting the meaning.
_________________

Thanks,
Ashish
EducationAisle, Bangalore

Sentence Correction Nirvana available on Amazon.in and Flipkart

Now! Preview the entire Grammar Section of Sentence Correction Nirvana at pothi.com

Hi Kunal, a run-on sentence is when two Independent clauses are connected by a comma. In both B and C, there is only one Independent clause:

Kudzu has overrun many houses and countless acres of roadside.

p.s. Our book EducationAisle Sentence Correction Nirvana discusses run-on sentence, its application and examples in significant detail. If someone is interested, PM me your email-id; I can mail the corresponding section.
_________________

Thanks,
Ashish
EducationAisle, Bangalore

Sentence Correction Nirvana available on Amazon.in and Flipkart

Now! Preview the entire Grammar Section of Sentence Correction Nirvana at pothi.com

I believe "rampant" and "rampantly" change the meaning of the clause, but ultimate have the same effect.
"An Asian vine that has grown rampant" --> An Asian vine has become rampant. --> The vine is everywhere.
"An Asian vine that has grown rampantly" --> An Asian vine that has spread rapidly. --> The vine is everywhere.

(A)
"since introducing it..." looks like the start of a non-finite clause, which means that what we might be saying is "[An Asian vine] has grown rampantly in the southern United States since [the Asian vine was] introducing it in the 1920s to thwart soil erosion". The subject of our non-finite clause become "An Asian vine".
If we knew with 100% certainty that "since" was being used as a preposition here, then I think this option would be fine. But because we can't know with 100% certainty, this option can be misinterpreted.
Thus, we can rule this out

(B)
The comma makes the sentence much more ambiguous. We know that the "since" clause is a subordinate of "An Asian vine" clause, but our readers may not. With the comma, the "since" clause could potentially be mistaken as a subordinate of the main "Kudzu" clause. We don't need commas for subordinate clauses, so we might as well leave this one out as it makes the sentence clearer.
We can rule this out

(C)
Nothing wrong here

(D)
Same problem with (A)
We can rule this out

(E)
Same problem with (B)
We can rule this out

I think there is a run on sentence in option B

An Asian vine that has grown rampantly in the southern United States =>"Asian vine"is the subject and "has" is a verb and it expresses a complete thought.
Since it was introduced in the 1920 for thwarting soil erosion => "it" is the subject which refers to Kudzu and "was" is the verb and it also expresses a complete thought.

Even if we consider "Since" as a dependent marker and 2nd clause as dependent clause. What is the intent of the OG Explanations "The adverbial Clause Since it was introduced in the 1920 should not be set off from has grown rampantly"



Experts Please help. GMATNinja