Use the observation in the first column to answer the question in the second column. observation question At 1 atm pressure, Substance A boils at and Substance B boils at . Which has a higher vapor pressure? Substance A Substance B Neither, A and B have the same vapor pressure. It's impossible to know without more information. At , Substance C has a vapor pressure of and Substance D has a vapor pressure of . Which has a higher boiling point? Substance C Substance D Neither, C and D have the same boiling point. It's impossible to know without more information. The enthalpy of vaporization of Substance E is smaller than that of Substance F. Which has the higher boiling point? Substance E Substance F Neither, E and F have the same boiling point. It's impossible to know without more information.