Given below are three schematic graphs of potential energy $V(r)$ versus distance $r$ for three atomic particles: electron $(e^{-})$,proton $(p^{+})$,and neutron $(n)$,in the presence of a nucleus at the origin $O$. The radius of the nucleus is $r_0$. The scale on the $V$-axis may not be the same for all figures. The correct pairing of each graph with the corresponding atomic particle is

• A
  $(1, n), (2, p^{+}), (3, e^{-})$
• B
  $(1, p^{+}), (2, e^{-}), (3, n)$
• C
  $(1, e^{-}), (2, p^{+}), (3, n)$
• D
  $(1, p^{+}), (2, n), (3, e^{-})$