If the 14C to 12C ratio present in a fossil is 25% of that in living organism, how many years have passed since this fossilized organism died?

If the 14C to 12C ratio present in a fossil is 25% of that in living organism, how many years have passed since this fossilized organism died?
A) 1,432
B) 2,865
C) 5,730
D) 11,460
E) 17,190

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