GMAT Sentence Correction (SC) | Re: The Center for public integrity has discovered that the drug

The Center for public integrity has discovered that the drug companies obtain people's health records through the Interneteither to contact them individually and suggest alternative forms of treating variousillnesses or the estimation of the market of each new drug they produce.

A. the estimation of.

B. to estimate.

C. for estimating.

D. they want to estimate.

E. it wants to estimate.

The green color should be parallel / idiomatic. Hence B
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