Find out the correct energy for the ground state or energy transition. (symbols have usual meaning \& $\mathrm { n } \rightarrow \mathrm { m }$ gives the transition)\
(A) $\mathrm { Be } _ { 2 \rightarrow 1 } ^ { 3 + } ( + 13.6 \mathrm { eV } ) \times$\
(b) $\mathrm { H } ( - 6.8 \mathrm { eV } )$\
(C) $\mathrm { He } _ { 2 \rightarrow 1 } ^ { + } ( 40.8 \mathrm { eV } )$\
(P) $\mathrm { Li } ^ { 2 + } ( - 13.6 \mathrm { eV } )$