The Amount Of ${ }_{6}^{14} \mathrm{C}$ In a Bone Is About One-Fourth of What One Would

The amount of ${ }_{6}^{14} \mathrm{C}$ in a bone is about one-fourth of what one would expect based on the relative abundance of ${ }_{6}^{14} \mathrm{C}$ and ${ }_{6}^{12} \mathrm{C}$ . Since the half-life of ${ }_{6}^{14} \mathrm{C}$ is a bit less than $6000 \mathrm{y}$ , the bone's age is closest to

A) $36,000,000 \mathrm{y}$ .
B) $24,000 \mathrm{y}$ .
C) $12,000 \mathrm{y}$ .
D) $4000 \mathrm{y}$ .
E) $1500 \mathrm{y}$ .