A Single Electron in Orbit Around a Helium Nucleus (Charge $\approx$

A single electron in orbit around a helium nucleus (charge = +2, mass $\approx$ 4) has energy levels $E _ { \mathrm { He } }$ that are related to those for the electron orbiting a hydrogen nucleus ( $E _ { \mathrm { H } }$ ) by the relation

A) $E _ { \mathrm { He } } = 4 E _ { \mathrm { H } }$
B) $E _ { \mathrm { He } } = 2 E _ { \mathrm { H } }$
C) $E _ { \mathrm { He } } = \left( \frac { 1 } { 2 } \right) E _ { \mathrm { H } }$
D) $E _ { \mathrm { He } } = \left( \frac { 1 } { 4 } \right) E _ { \mathrm { H } }$