Which Type of Radiation Is Being Emitted in the Following $\begin{array} { c } 218\\84\end{array}$

Multiple Choice

Which type of radiation is being emitted in the following incomplete nuclear equation? $\begin{array} { c } 218\\84\end{array}$ Po ? $\begin{array} { c } 214\\82\end{array}$ Pb + ??

A) alpha
B) beta
C) gamma
D) A and B
E) none of the above