The concentration of dissolved O2 in water that is required to support aquatic life is 4.0 mg L . Calculate the minimum partial pressure of oxygen...

For this question I tried to use the formula c=KP , but I am still not getting it. Is their some other calculation were meant to do?

A18. The concentration of dissolved O2 in water that is required to support aquatic life is4.0 mg L . Calculate the minimum partial pressure of oxygen in the atmospherethat is required to achieve this concentration. (KH = 1.28 x 10 mol L' Par foroxygen in water).(A) 9.8 MPa(B) 1.0 x 10 4 Pa(C) 9.8 kPa(D) 1.6 x 10-12 Pa(E) 1.0 kPa