Answer:
These are different types of clouds which are categorized on the basis of their height and structure obtained.
Cloud A: This type of cloud is known as stratus. These are lowest clouds.Their shape is like flat sheet of gases.
Cloud B: This type of clouds are known as Cumulonimbus clouds. These are clouds which come in the category of highest clouds. But there are types which are more higher than these clouds.There shape is like the boiling or elevation of gases from a point. They are thicker and can block sunlight.
Cloud C: These are highest forms of clouds and known as cirrocumulus, cirrus, and cirrostratus. They are broken sheets of gas layers. They can or can not block the light.