[" Which one of the following elements has the highest ionization energy."],[[" (A) (Hel "3s^(2)3p^(1)," (B) "[" He "],3s^(2)3p^(2)," (C) (Hel "3s^(2)3p^(3)," (D) "[" Arl "3d^(10)4s^(2)4p^(2)]]