If the root word cirro- means "high," which word means "a high-altitude cloud made up of smaller clouds"? select one of the options below as your a. cirrostratus b. cirrocumulus c. cirrus

I think the correct answer is option B. A cirrocumulus cloud is a  high-altitude cloud made up of smaller clouds. It is one of the three types of high-altitude clouds. Others are the cirrus and cirrostratus. It occurs at an altitude from 5 to 12 kilometers.