Respuesta :
The process that allows for energy to be built up in cumulonimbus clouds is Water droplets freeze in the cumulonimbus clouds.
How are cumulonimbus clouds formed?
As a result of evaporation, water droplets enter the atmosphere. Due to the atmosphere being cold, these water droplets will freeze.
As more water droplets freeze, they clump together and form cumulonimbus clouds which will then fall as rain when the cloud becomes too heavy.
In conclusion, option A is correct.
Find out more on cumulonimbus clouds at https://brainly.com/question/1307031.