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Verbal·Expression of Ideas·Transitions

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Some fungi can break down petroleum pollutants in contaminated soil, a process known as mycoremediation. The oyster mushroom Pleurotus ostreatus, for example, secretes enzymes that degrade hydrocarbons into simpler, less harmful compounds.        the fungus grows slowly in cold soils and may take years to clean sites with heavy contamination.

Which choice most logically completes the text?

A

For this reason, the fungus is the preferred choice for cleanups in cold climates;

B

In fact, the fungus works most quickly at heavily contaminated sites;

C

Similarly, certain bacteria can also break down petroleum hydrocarbons;

D

That said, the fungus may not be practical for every cleanup project;