Which of the Following Nuclear Equations Correctly Describes Alpha Emission $\begin{array} { c } 234\\90\end{array}$

Multiple Choice

Which of the following nuclear equations correctly describes alpha emission?

A) $\begin{array} { c } 234\\90\end{array}$ Th ? $\begin{array} { c } 234\\91\end{array}$ Pa + $\begin{array} { c } 0 \\- 1\end{array}$ e
B) $\begin{array} { c } 234\\90\end{array}$ Th ? $\begin{array} { c } 234\\89\end{array}$ Ac + $\begin{array} { c } 0 \\- 1\end{array}$ e
C) $\begin{array} { c } 234\\90\end{array}$ Th ? $\begin{array} { c } 235\\91\end{array}$ Pa + $\begin{array} { c } 0 \\- 1\end{array}$ e
D) $\begin{array} { c } 234\\90\end{array}$ Th ? $\begin{array} { c } 0 \\- 1\end{array}$ e
E) none of the above