An Atom Has Completely Filled Inner Shells and a Single $p$

Multiple Choice

An atom has completely filled inner shells and a single valence electron in an excited $p$ state. The filled inner shells have an orbital momentum equal to zero. When a magnetic field is applied, what are the possible angles between the magnetic field and the orbital angular momentum?

A) $45 ^ { \circ } , 90 ^ { \circ } , 135 ^ { \circ }$
B) $45 ^ { \circ } , 90 ^ { \circ }$
C) $45 ^ { \circ } , 135 ^ { \circ }$
D) $90 ^ { \circ }$
E) $45 ^ { \circ }$