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18. Several items were discovered in a cave on Samoa. The C content was analyzed. The results showed that the C content was decaying at an average rate of9.3 dpm/g C. When were the artifacts likely created? (The current C/12C ratio is 15 dpm/g C and the half-life of 1C is 5730 years) A. 4700 years B s C. 4300 years D. 4200 years E. 4000 years

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