How Do Hydrogen Bonds Tend to Affect the Melting and Boiling

How do hydrogen bonds tend to affect the melting and boiling points of substances?

A) They tend to increase both melting and boiling points.
B) They tend to decrease both melting and boiling points.
C) They tend to increase melting points and decrease boiling points.
D) They tend to decrease melting points and increase boiling points.
E) They do not have any affect on either melting or boiling points.