If one were to attempt to mix carbon dioxide and hexane at 0°c and under very high pressure, what would that person likely observe? (* the boiling point of carbon dioxide is well below 0°c).

a) the substances will mix uniformly.
b) the substances will separate into two separate layers of liquid.
c) the substances will separate into two separate layers, a liquid and a gas.
d) the two substances will mix but then hexane will separate by rising to the top of the solution.