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Review: Wetland Function
Explanation
Creating a filter: The prompt raises a flag. Namely, we
have a list, so something to check quickly is whether the elements of the list
are in parallel form. By the way, there's no problem with separating the
elements of a list in a sentence with semicolons, especially when some or more
of the items are lengthy. This is a list of verbs, and they are "preventing,"
"filtering and purifying" and "release." "Release" is in error and should match
the other two as "releasing." Since "preventing" is outside the underlined
portion and hence can't be changed, we know that we will have to settle on "ing"
forms in the correct answer.
Applying the filter: There's only one answer choice
meeting our criterion. The correct answer is (B).
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