$3$ H Is a Radioactive Isotope of Hydrogen $\begin{array} { l } 1 \\1\end{array}$

$3$ H is a radioactive isotope of hydrogen. One difference between hydrogen-1 ( $\begin{array} { l } 1 \\1\end{array}$ H) and hydrogen-3 ( $\begin{array} { l } 3 \\1\end{array}$ H) is that hydrogen-3 has

A) one more neutron and one more proton than hydrogen-1.
B) one more proton and one more electron than hydrogen-1.
C) one more electron and one more neutron than hydrogen-1.
D) two more neutrons than hydrogen-1.
E) two more protons than hydrogen-1.