(Solved): This diagram represents energy levels in the hydrogen atom (energies denoted in electron volts, eV) ...

This diagram represents energy levels in the hydrogen atom (energies denoted in electron volts, eV), with the ground state labeled level \( 1(0.0 \mathrm{eV}) \). The transitions (A through E) show some of the possible (or impossible) transitions for an electron in the atom. Which transition is forbidden (will not happen)?