What is the main reason hailstones can become large in cumulonimbus clouds?

Correct answer: Repeated freezing of ice layers due to strong updrafts

Correct answer: B. Cumulonimbus clouds contain powerful vertical currents. These updrafts can lift a small ice particle upward into very cold parts of the cloud, where supercooled water droplets freeze onto it. The growing hailstone may then fall into a region containing liquid droplets and be carried upward again. Repeated journeys through different parts of the cloud add layers of ice, allowing the hailstone to become large before gravity finally brings it down. Option A is wrong because a completely dry cloud would not provide the water needed for ice growth. Option C is wrong because clouds do not settle onto the ground to form hail. Option D is wrong because air movement, especially strong updrafts, is central to hail growth. B therefore gives both the process and the necessary atmospheric condition. Memory cue: “strong updrafts keep hail aloft and add ice layers.”