Answer:
[D] Cumulonimbus
Explanation:
When the top of a cumulus reaches above, the water droplets are transformed into ice crystals and it loses its clear, sharp outline. It transformed into ice crystals because when it reaches it height the place is cold. As well as at this stage the cloud has become a cumulonimbus. And thus, the type of cloud is made up of both Liquid water droplets and ice crystals are called Cumulonimbus.
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Kavinsky
