If $M_0$ is the initial mass of a radioactive substance with a half-life of ${t_{1/2}} = 5 \text{ years}$,what is the amount of substance remaining after $15 \text{ years}$?
- A$\frac{M_0}{8}$
- B$\frac{M_0}{16}$
- C$\frac{M_0}{2}$
- D$\frac{M_0}{4}$
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