If two clouds have the same water amount but one has smaller droplets in which is immediate rainfall less likely?

Correct answer: In the cloud with smaller droplets

Answer: B. A cloud can contain much water without producing immediate rainfall because its droplets may be extremely small. Small droplets have little mass and a low downward-falling speed, so air movement can keep them suspended. They need to grow, for example through collision and coalescence, until gravity can overcome the upward or turbulent air movement sufficiently for precipitation to fall. Equal total water does not mean equal rainfall ability: the distribution of that water among droplets matters. A is wrong because larger drops are generally more likely to fall and begin rainfall. C is wrong because heavy rain is not guaranteed merely by the presence of water in a cloud. D is wrong because clouds can form with either droplet size. Memory cue: same water, smaller pieces means slower fall. Always connect droplet size and mass with the chance of immediate precipitation.