The evaporation process in the water cycle is caused by the ocean the wind the sun the earth

The answer to the question stated above is "the Sun".

The evaporation process in the water cycle is caused by the sun. When water is heated by the direct heat of the sun, water goes up in the form of water vapor (thus, evaporation takes place). The water vapor that goes up is transformed into liquid water droplets in the air, creating clouds and fog. 

Ithink the answer is d.