Read this paragraph. The sun is a star, a hot ball of glowing gases at the heart of our solar system. Even though our sun is special to us, there are billions of stars like it scattered across the Milky Way galaxy. If the sun were as tall as a typical front door, the Earth would be the size of a U. S. nickel.

Which of the following best explains how text structure is used in this paragraph?

A. to examine similarities and differences among a set of concepts

B. to link a series of earlier and later events

C. to present a description that helps the reader form a mental picture

D. to state a problem and describe a solution to that problem