The boiling point of $NH_3$ is much higher than that of $PH_3$ because.......

• A
  $NH_3$ has a much higher molecular weight.
• B
  $NH_3$ undergoes pyramidal inversion.
• C
  $NH_3$ molecules form hydrogen bonds.
• D
  $NH_3$ has ionic bonds while $PH_3$ has covalent bonds.