At 25∘C, the vapor pressure of diethyl ether, (CH3​CH2​)2​O, is higher than the vapor pressure of its isomer n-butanol, CH3​CH2​CH2​CH2​OH, because:

a. diethyl ether has stronger intermolecular forces than n-butanol.
b. diethyl ether has a higher surface tension than n-butanol.
c. diethyl ether has a higher density than n-butanol.
d. diethyl ether has a lower critical temperature than n-butanol.
e. diethyl ether has weaker intermolecular forces than n-butanol.