Phases of matter are described by the composition of the particles. When heat is removed from a system then the liquid is formed as particles move closer together. Thus, option a is correct.
What is the liquid phase?
The liquid is a phase of matter defined by the free movement and rotation of the particles in the matter. This results in them having indefinite shapes, unlike the solids.
The liquids have closer space than the gaseous particles and undergo transition under high pressure and low temperature. When heat is removed from the system then particles come closer due to low collision and kinetic energy.
Therefore, option a. liquid is formed when heat is removed.
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