Carbon-14 has a half-life of 5730 years. How long would it take 4 grams of Carbon-14 to decay to 1 gram of Carbon-14?

A: 1 year

B: 5730 years

C: 11,460 years

D: 17,190 years

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Which answer choice best explains why atoms of carbon-14 (C-14) are unstable?

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