Your image isn't clear so I couldn't see the proper option but lucky for you I have seen this question before so I will tell you the answer.
The answer is option D (facilitated diffusion).
Actually, large drops of rain form in a cumulonimbus cloud are stated by water vapor condensing in large quantity. If the humidity is very high, or around 100%, water droplets will form extra large during the condensation process. Additionally, this increases the size of the cloud. The droplets will amalgamate to form even larger rain drops that fall because of gravity. I hope this helps! :))
Ps. Cumulonimbus clouds also produce hail, but that hail is not the reason for why they produce big rain drops.
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