What Is the Complete Nuclear Symbol for X in the Equation

What is the complete nuclear symbol for X in the equation for radioactive decay shown below? 14
6 C ? 14
7 N + X

A) $$0$$
$- 1$ e
B) $\begin{array} { c } 0 \\+ 1\end{array}$ e
C) 4
2 ?
D) $$0$$
0 ?
E) None of the choices are correct.