___and ___exert pressure on the walls of the vessel in which they are carried out A) Solid, liquid and Gases

B) Gases and solids

C) Liquids and gases

D) Solid and gases

C) Liquids and gases

Explanation:

The correct answer would be liquids and gases.

The molecules of liquids and gases move randomly when held in a container. The random movement causes a collision between the molecules of the liquids/gases and between the walls of the container, creating pressure in the process. This is unlike the molecules of solids that vibrate about fixed positions.

Hence, the correct option is C.