A Neutral Hydrogen Atom Consists of a Proton and an Electron

Multiple Choice

A neutral hydrogen atom consists of a proton and an electron. The energy of the atom is

A) the same regardless of the relative spin orientations of the two particles.
B) highest when the proton spin and the electron spin are perpendicular to each other.
C) highest when the proton spin and the electron spin directions are parallel.
D) highest when the proton spin and the electron spin directions are antiparallel.