Which of the following represents an isotope of carbon?

A. Carbon-12 and Carbon-14
B. Carbon-12 and Nitrogen-12
C. Carbon-12 and Oxygen-12
D. Carbon-14 and Oxygen-14

Answer: Carbon-12 and Carbon-14

Additional Information: Carbon-12 and Carbon-14 are isotopes of carbon, differing in their number of neutrons.

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