Why does moist air have a higher chance of forming clouds when it rises?

Correct answer: Air cools as it rises

Direct answer: B, air cools as it rises. Atmospheric pressure generally decreases with height, so rising air expands. Expansion uses energy and causes the air to cool. Cooler air has a lower water-vapour holding capacity. If moist rising air cools to saturation, water vapour condenses on suitable particles into tiny droplets or ice crystals; these gathered particles form clouds. A is incorrect for the usual rising-air process because expansion causes cooling rather than guaranteed warming. B gives the key step. C is wrong: vapour does not simply disappear; it may change into liquid droplets or ice through condensation. D is wrong because wind does not necessarily stop when air rises. A safe sequence is: moist air rises, expands, cools, reaches saturation, condenses, and may form clouds. Cloud formation does not automatically guarantee rainfall, because droplets must grow sufficiently large to fall.