An Electron Has an Intrinsic Magnetic Moment That We Can $\vec{B}$

An electron has an intrinsic magnetic moment that we can model as being due to the electron spinning around an axis. In an external magnetic field $\vec{B}$ , in which direction will the electron's spin angular momentum vector $\vec{S}$ point when the electron is in its lowest-energy orientation?

A) $\vec{S}$ will be aligned with $\vec{B}$ .
B) $\vec{S}$ will be perpendicular to $\vec{B}$ .
C) $\vec{S}$ will be opposite to $\vec{B}$ .