The process by which a solid changes into a liquid is called
Melting
Explanation for correct option :
(B) Melting:
Explanation for incorrect options:
(A) Freezing: It is the process by which a substance in liquid state changes into a solid-state is called freezing.
(C) Condensation: It is the process by which a substance in gaseous state changes into its liquid state is called condensation.
(D) Evaporation: It is the process by which a substance in liquid state changes into vapour is called evaporation.
Therefore, option (B) melting is the correct answer.