Answer:
Milk
Step-by-step explanation:
We aren't given the temperature and pressure conditions, so we must assume standard conditions of room temperature and 1 atmoshere pressure.
ice cubes NO. By definition, they are solid water.
milk YES, it is an emulsion, but still a liquid (not a solution)
rock NO, unless it is coming from a volcano
fog No, fog is small condensed water vapor droplets.
rain No, liquid
oxygen No, gas