In Understanding Why Group 16 Hydrides, Other Than Those in Period

Multiple Choice

In understanding why group 16 hydrides, other than those in period 2, have a higher boiling point than the hydrides of groups 14, 15, and 17, which of the following are most important to consider?
I.dispersion forces
II.dipole-dipole forces
III. hydrogen bonding

A) only I
B) only III
C) both I and II
D) both II and III
E) both I and III