The sentence claims that demands for river water may change the saline content of the bay, possibly altering the flavor and size of oysters there and diminishing the oysters’ marketability. The sentence is not parallel. It should read which would rob the oysters …
and make them decrease to be parallel and grammatical. The series of three phrases after
make them that describes what will happen to the oysters also needs to be parallel.
A.The referent of the relative pronoun, which, is ambiguous; the two effects of altered
saline content are not expressed in parallel form, with a relative clause expressing the first effect, and an infinitive phrase expressing the second.
B.The referent of the pronoun it is ambiguous. Also, the effects of the bay’s altered saline content are not expressed in parallel form—the first being an independent clause and
the second a verb phrase.
C.The comma before the conjunction and signals that an independent clause will follow
and, but a verb phrase follows instead. The series of phrases following making them
lacks appropriate parallelism.
D.Correct. The potential effects on the oysters are expressed by two parallel participial phrases, the second of which lists three adjectives correctly in a series.
E.The series of phrases following making them lacks appropriate parallelism.
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