Question

Which sentence is punctuated correctly?
a. A number of biotech firms are represented, Amgen, Genentech, Genzyme, and ImClone Systems.
b. A number of biotech firms are represented Amgen, Genentech, Genzyme, and ImClone Systems.
c. A number of biotech firms are represented: Amgen, Genentech, Genzyme, and ImClone Systems.

Answer

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