Answer:
A. solid > liquid > gas
Step-by-step explanation:
The lists of phases in order from most dense to least dense for most materials, is solid>liquid>gas.
In solids, the molecules are tightly packed together and are not free to move about due to their strong intermolecular force of attraction. The nature of the molecules (tightly packed) makes the solids more denser than liquid and gases.
Similarly, the liquid are less tightly packed compare to solids and they can move about making this phase less dense than solids
Gases have weak intermolecular force of attraction between them. They are not tightly packed and the molecules are more far from each other than in liquids and solids. This property of gas makes the phase the least dense among all the phases of matter.
Example of solid is glass, liquid is water and gas is carbondioxide
In terms of their density, glass>water>carbondioxide