Of the Following Angular Components for the Wave Functions of One-Electron

Multiple Choice

Of the following angular components for the wave functions of one-electron atoms, which one(s) must correspond only to s type orbitals?

A) $Y=\left(\frac{3}{4 \pi}\right) ^{\frac{1}{2}} \cos \theta$
B) $Y=\left(\frac{3}{4 \pi}\right) ^{\frac{1}{2}} \sin \theta \cos \phi$
C) $Y=\left(\frac{15}{16 \pi}\right) ^{\frac{1}{2}} \sin ^{2} \theta \cos 2 \phi$
D) $Y=\left(\frac{1}{4 \pi}\right) ^{\frac{1}{2}}$
E) B and C