Chema is a factory that creates plastics and plastic related products for the chemical and pharmaceutical industries. It has two options to reduce harmful emissions from its factory - installing scrubbers in its smokestacks and switching to cleaner-burning fuel. Since scrubbers can reduce more harmful emissions than cleaner-burning fuels can, Chema is doing the most it can do to reduce harmful emissions from its factory by installing scrubbers.
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) Chema is not necessarily committed to reducing harmful emissions from its factories.
(C) Harmful emissions from Chema's factories cannot be reduced more by using both methods together than by the installation of scrubbers alone.
(D) Aside from harmful emissions from the smokestacks of its factories, the activities of Chema do not cause significant air pollution.
(E) Chema can choose from various kinds of scrubbers, some of which are more effective than others.
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