(A) : Sea water boils at higher temperature than distilled water.
(R) :Addition of non volatile solute to a solvent lowers the vapor pressure.

When a non-volatile solute—one without its own vapor pressure—is present in a solution, the solvent's vapor pressure above the solution is directly proportional to the mole fraction of solvent in the solution. Raoult's Law encapsulates this phenomenon. Yes, the presence of salt in water raises its boiling point, but salt does not raise the water's vapor pressure because the water's temperature and mole fraction of other counterpart is the sole factor that affects vapor pressure.
Hence, correct option is: (A) Both (A) and (R) are true and (R) is the correct explanation of (A)