Answer:
Option A, accumulation
Step-by-step explanation:
As we can see in the image, the water gets heated and convert its pahse from liquid to gas i.e from liquid water to water vapor. As it rises above, it condenses and converts from water vapor into liquid water. The liquid water then moves in the downward direction and collects at the base. This process of collection at base can be related to accumulation of running water.
Option A is correct