How does the sun affect the water cycle? The sun does not affect the water cycle.
Sunspots cause surface water to condense.
Cooling water vapor causes it to evaporate and form clouds.
Heating surface water causes it to evaporate and enter the air as a gas.

i think the answer is D.

heating surface water causes it to evaporate and enter the air as a gas.

think about the oscillation of the toy shown in the video. when the toy is at the highest point of its motion, its velocity is zero and its acceleration is negative.