Suppose sea water is 0.38M aqueous solution of NaCl at $27°C$. Then the pressure needed to purify sea water is:

Molarity of seawater = C = 0.38 M

Temperature $= 27°C = 300 K$

$R = 0.0821 L\left(atm\right) K^{-1} mo{l}^{-1}$

The pressure needed to purify sea water = CRT = $0.38\times 0.0821\times 300 = 9.36 \mathrm{atm}$

Therefore, the required answer is B) > 9.36 atm.