During summer, water kept in earthen pot becomes cool due to phenomenon ofADistillationBEvaporationCDiffusionDTranspiration

During summer, water kept in earthen pot becomes cool due to the phenomenon of Evaporation.

Here's the step by step explanation:

1. Earthen pots are porous. This means they have small holes, or pores, which allow water to seep through to the outer surface.

2. When the water reaches the outer surface of the pot, it is exposed to the heat from the environment.

3. This heat provides the water molecules with enough energy to change from a liquid state to a gaseous state, a process known as evaporation.

4. Evaporation is an endothermic process, meaning it absorbs heat. So, as the water evaporates from the surface of the pot, it takes in heat from the surrounding environment, including the remaining water inside the pot.

5. This absorption of heat cools down the water inside the pot.

So, the correct answer is B - Evaporation.