One Difference Between Carbon-12 $\begin{array} { r } 12 \\6\end{array}$

Multiple Choice

One difference between carbon-12 ( $\begin{array} { r } 12 \\6\end{array}$ C) and carbon-14 ( $\begin{array} { r } 14 \\6\end{array}$ C) is that carbon-14 has

A) two more protons than carbon-12.
B) two more electrons than carbon-12.
C) two more neutrons than carbon-12.
D) A and C only
E) B and C only