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Which choice best introduces the topic of this
sentence?
A) NO CHANGE
B) The EPA can only regulate a new chemical if it can
prove that the chemical poses "unreasonable risk,"
but
C) Because there is controversy over which tests can
best determine whether a chemical is safe,
D) It's hard to know whether the lack of regulation
is more the fault of the TSCA, or the EPA itself
needs reform, and


Which Choice Best Introduces The Topic Of This Sentence A NO CHANGE B The EPA Can Only Regulate A New Chemical If It Can Prove That The Chemical Poses Unreasona class=