12.When a nonvolatile solute is added to a volatile solvent, the solution vapor pressure    a    , the boiling point     b    , the freezing point    c     , and the osmotic pressure across a semipermeable membrane    d    .Please select the most appropriate descriptions that fit the blanks alphabetic.
(A) decreases, increases, decreases, decreases
(B) decreases, increases, decreases, increases
(C) increases, increases, decreases, increases
(D) decreases, decreases, increases, decreases
(E) increases, decreases, increases, decreases