For the Vaporization of a Liquid at a Given Pressure $\Delta$

For the vaporization of a liquid at a given pressure:

A) ( $\Delta$ G) is positive at all temperatures.
B) ( $\Delta$ G) is negative at all temperatures.
C) ( $\Delta$ G) is positive at low temperatures,but negative at high temperatures (and zero at some temperature) .
D) ( $\Delta$ G) is negative at low temperatures,but positive at high temperatures (and zero at some temperature) .
E) None of these (A-D) .