Polonium, Po, has a proton number of 84 and a nucleon number of 218. Polonium decays to astatine, At, by releasing a $\beta$-particle. Which equation shows this decay?
- A$^{218}_{84}\text{Po} \rightarrow ^{218}_{85}\text{At} + ^{0}_{-1}\beta$
- B$^{218}_{84}\text{Po} + ^{0}_{-1}\beta \rightarrow ^{218}_{85}\text{At}$
- C$^{218}_{84}\text{Po} \rightarrow ^{218}_{85}\text{At} + ^{0}_{-1}\beta$
- D$^{218}_{84}\text{Po} + ^{0}_{-1}\beta \rightarrow ^{218}_{85}\text{At}$