Correct Answer: Hydrogen bonding
Reason:
In methyl amine (i.e. CH3NH2) several inter-molecular forces of interaction may be operable. This includes:
1) Dipole-Dipole interaction
2) Dipole-induced dipole intraction
3) van der Waal's interaction
4) Hydrogen bonding
Among all the listed interactions, hydrogen bonding is the strongest. With reference to hydrogen bonding, it exist in system when 'H' atom is bonded to electronegative element like N, O and F.