posted by Donna .
The boiling point of a liquid at atmospheric pressure is the temperature:
a. at which bubbles of vapor expand within the liqud
b. at which the liquid solidifies
c. at which the vapor pressure first exceeds the critical temperature
d. at which the vapor pressure is equal to the atmospheric pressure
d. 100 degree C
Look up the definition of boiling point. That's all you need t know, the definition.