the normal boiling point of a liquid is

A)

the only temperature at which there can be equilibrium between the liquid and gas

states.

B)

the temperature above which the substance cannot exist as a liquid regardless of the

pressure.

C)

the temperature at which the amounts of liquid and gas are equal.

D)

the temperature at which the vapor pressure equals atmospheric pressure.

E)

the temperature at which all three phases are in equilibrium