Which of the substances below would have the lowest boiling point?
propane, with a vapor A.pressure of 998 kPa at 293K
B.water, with a vapor pressure of 2.3 kPa at 293K
C.ethanol, with a vapor pressure of 5.83 kPa at 293 K
D.butane, with a vapor pressure of 220 kPa at 293 K