Gmat 逻辑题,OG的498页,逻辑43题~

Gmat 逻辑题,OG的498页,逻辑43题~
Installing scrubbers in smokestacks and switching to cleaner-buring fuel are the two methods available to Northern Power fro reducing harnful emissions from its plants.Scrubbers will reduce harmful emissions more than cleaner-buring fuels will.Therefore,bu installing scrubbers,Northern Power will be doing the most that can be done to reduce harmful emissions from its plants.
which of the following is an assumption on which the argument depends?
A.Switching to cleaner-burning fuel will not be more expensive than installing scrubbers.
B.Northern Power can choose from among various kinds of scrubbers,some of which are more effective than others.
C.Northern Power is not necessariliy committed to reducing harmful emissions from its plants.
D.Harmful emissions from Northern Power's plants cannot be reduced more by using both methods together than by the installation of scrubbers alone.
E.Aside from harnful emissions from the smokestacks of its plants,the activities of Northern Power do not cause signifucant air pollution.