Answer: A. Gases are easily compressed because of the low density.
Explanation:
Solid state : In this state, the molecules are arranged in regular and repeating pattern. The molecules are closely packed that means high inter molecular forces are present and they have high density. They are incompressible.
For example : Copper
Liquid state : In this state, the molecules are present in random and irregular pattern. The molecules are closely packed but they can move from one place to another and thus have low density.
For example : water
Gaseous state : In this state, the molecules are present in irregular pattern. The molecules have low inter molecular forces of attraction and they can move freely from one place to another and spread out and are least dense. They are easily compressible due to large spaces between molecules.
For example : Helium gas