GMAT Critical Reasoning (CR) | Re: Installing scrubbers in smokestacks and switching to

Installing scrubbers in smokestacks and switching to cleaner-burning fuel are the two methods available to Northern Power for reducing harmful emissions from its plants. Scrubbers will reduce harmful emissions more than cleaner-burning fuels will. Therefore, by installing scrubbers, Northern Power will be doing the most that can be done to reduce harmful emissions from itsplants.
Scrubber > Cleaner burning fuel

Which of the following is an assumption on which the argument depends?

(A)Switching
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