Respuesta :
Answer: Option (b) is the correct answer.
Explanation:
When thermal energy is added to a substance then there will occur an increase in the kinetic energy of molecules. As a result, motion of particles increases due to which a solid substance changes into liquid state and a liquid substance changes into gaseous state.
When a liquid substance gets converted into vapors or gaseous state then this process is called vaporization.
Thus, phase changes that requires the addition of thermal energy is vaporization.
