Balance the Equation ${ }_{86}^{222} \mathrm{Rn} \rightarrow{ }_{2}^{4} \mathrm{He}+?$ A) ${ }_{84}^{218} \mathrm{Po}$

Balance the equation ${ }_{86}^{222} \mathrm{Rn} \rightarrow{ }_{2}^{4} \mathrm{He}+?$

A) ${ }_{84}^{218} \mathrm{Po}$
B) ${ }_{88}^{218} \mathrm{Ra}$
C) ${ }_{84}^{226} \mathrm{Po}$
D) ${ }_{84}^{226} R a$
E) None of the above