Which of the Following Would Be Expected to Have the Lowest

Multiple Choice

Which of the following would be expected to have the lowest vapor pressure at room temperature?

A) dimethyl sulfoxide, boiling point = 189°C
B) 1-pentanol, boiling point = 137°C
C) diethyl ether, boiling point = 34.6°C
D) acetone, boiling point = 56°C
E) The vapor pressure of each of the liquids at room temperature would be the same.