GMAT Sentence Correction (SC) | Re: The primary catalyst fueling the rapid spread of wind farms

The primary catalyst fueling the rapid spread of wind farms across the country – from offshore platforms along the coasts to the vast deserts and plains– has been a combination of federal tax incentives and state mandates requiring utilities to increase the percentage of renewable power in their overall energy production portfolio.

A. has been a combination of federal tax incentives and state mandates requiring utilities to increase the percentage of renewable power in their ---- "a
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