Why does the temperature not change
during a phase change?
There is a change from potential energy
to kinetic energy. Changes in potential
energy do not result in temperature
changes
No one really knows. We just see this
when we do an experiment involving
phase changes
There is a change from kinetic energy to
potential energy Changes in potential
energy do not result in temperature
changes

Option A

Explanation:

Temperature of a body is due to the heat gained or loss. During a phase change, the atoms or molecules of a substance are undergoing change is temperature due to which no temperature change is observed during phase change. The heat in the transition phase is used to break bonds and the change in temperature is felt when kinetic energy change is complete. During transition, the average kinetic energy of the molecules remains unchanged and hence during a phase change a temperature do not changes until unless the phase change is completed.

Hence, option A is correct