The four families of clouds are _______ .

The four families of clouds are _______ .

A.stratus, cumulus, nimbus, and cirrus

B.clouds formed by updrafts, fronts, cooling layers of air, and precipitation into warm air

C.high, middle, low, and those with extensive vertical development

D.altocumulus, nimbostratus, cirrus, and towering cumulus

正确答案是C