Which one of the following statements is true concerning the radioisotope carbon-14 that is used...

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Which one of the following statements is true concerning the radioisotope carbon-14 that is used in carbon dating?
(A) Carbon-14 is produced by living cells.
(B) Carbon- 14 is produced during \( \beta^{-} \)decay.
(C) Carbon- 14 is produced by the decay of carbon- 12 .
(D) Carbon- 14 is produced by cosmic rays striking the atmosphere.
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