GMAT Sentence Correction (SC) | Re: While the new health insurance regulations may be onerous for large co

Source: McGraw Hill GMAT

While the new health insurance regulations may be onerous for large corporations,it can potentially be disastrous for small business owners, who in many cases will have to lay off employees in order to pay for the extended coverage.

A.it can potentially be disastrous for small business owners, who
B. they are potential disasters for small businessowners, since
C. potentially they will be disastrous for small businessowners, whom
D. for small business ownersit is