The correct option is D All these are possible
A liquid solution that contains solid, liquid or a gas dissolved in it is the common example that we come across in everyday life.
Sugar solution can be an example of 'Solid in Liquid' solution
Aerated drinks are best examples of gas dissolved in water, which is a 'Gas in Liquid' solution.
Air containing different gases itself is an example for 'Gas in Gas' type of solutions.
So, all the given combinations can form solutions.