One mole of liquid A and 2 moles of liquid B make a solution having a total vapor pressure of 40 torr. The vapor pressure of pure A and B are 45 torr and 34 torr respectively. The solution

a) Will have a vapor pressure of 35 torr
b) Will have a vapor pressure of 40 torr
c) Will have a vapor pressure of 39 torr
d) Will have a vapor pressure of 38 torr