Which of the following best describes the structure of the section “What Are Some Types of Clouds” (Paragraphs 3-4)? A. The author describes of the height of different kinds of clouds and then gives examples of their shapes. B. The author lists all of the different names of clouds and describes how quickly each kind of cloud moves. C. The author compares the shapes of large clouds to the shapes of smaller clouds. D. The author explains the science behind how clouds form.