Water kept in an earthen pitcher, during summer days becomes very cold due to
Evaporation
Option(b)
Evaporation: It is the type of vaporization which occurs on the surface of the liquid.
The liquid will get converted into the gas state in evaporation.
The earthen pitcher has small holes in its body because of which some water droplets come out and get evaporated easily on summer days.
The evaporation of water droplets from the earthen pitcher surface results in a decrease in the temperature and water kept in an earthen pitcher, during summer days becomes very cold.
Option(a)
Condensation: It is the reverse of evaporation.
In this water vapor in the environment gets converted into liquid.
This phenomenon is not taking place in the case of water stored in an earthen pitcher.
Option(c)
Freezing: In this liquid state will convert into a solid-state.
Freezing will not take place in the case of an earthen pitcher.
The state of liquid is not changed in the cooling of water from an earthen pitcher.
Option(d)
Fusion: It is defined as the joining of atoms to form a heavier atom.
No fusion is taking place in cooling water using an earthen pitcher.
Hence, option(B) is correct.