Which type of clouds are pictured here?

A Cumulonimbus
B Cumuliform
C Cirriform

Cumulonimbus clouds are large, towering clouds associated with thunderstorms and severe weather. Anvil top—a flattened surface—is a distinctive feature of these clouds, often seen in mature thunderstorms. Hence, another name for them is anvil clouds.

Correct Answer: Cumulonimbus