Which cloud generally occurs at a very high altitude?

Correct answer: Cirrus cloud

Correct answer: B, cirrus cloud. Cirrus clouds are generally found at very high altitudes. They are thin, delicate, white, and often look feathery or hair-like because they are made largely of ice crystals in the cold upper atmosphere. B is therefore the best answer. Stratus clouds usually form in broad lower layers, while stratocumulus clouds are generally low, lumpy layers. Cumulus clouds are puffy clouds that commonly develop at low or middle levels, although their height can vary and some may grow upward. The question asks for the cloud generally associated with very high altitude, so the distinctive high, wispy appearance of cirrus is the important clue. Memory cue: cirrus sounds like a fine, wispy “brush” high in the sky; do not confuse it with cumulus, which looks like a cottony heap.