- AFrost
- BFog
- CThunderstorm
- DDew
Step-by-Step Solution
The relation is a kind of cloud : the weather that cloud announces. Thin wispy cirrus riding very high in a clear sky goes with fair weather; the towering anvil-headed cumulonimbus brings the thunderstorm, with its lightning and its downpour. Frost and dew are laid on the ground on still cold nights and need no cloud overhead at all, and fog is itself cloud resting on the ground rather than weather sent down by a cloud above.
Answer: C) Thunderstorm