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AjiteshArun
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i think research into is correct ..will go with C
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With aceGMAT21

Correct answer must be (D) for the explanation provided..
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aceGMAT21
OA should be D. :-)

Thanks.
-Varun
You're right, it's D. However, for now, I recommend that test takers use the following guidance for research:

1. Treat to research on/into/about (verb form) as incorrect.

2. Be open to research on/into/about if research is used as a noun.

So, (a) the research on, (b) the research into, and (c) the research about should be okay. But (a) I want to research on, (b) I want to research into, and (c) I want to research about should not be considered correct.

At an individual level some test takers could be comfortable using to research on/into/about, but we'll avoid that as a result of the position taken in OG2017 #697.
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