In Which Case Should CO₂(g)be More Soluble in Water

Multiple Choice

In which case should CO₂(g) be more soluble in water?

A) The total pressure is 6 atm and the partial pressure of CO₂ is 1 atm.
B) The total pressure is 4 atm and the partial pressure of CO₂ is 3 atm.
C) The total pressure is 1 atm and the partial pressure of CO₂ is 0.03 atm.
D) The total pressure is 1 atm and the partial pressure of CO₂ is 0.4 atm.