What is a diagram?

• A. The smaller title that goes before a new paragraph.
• B. A drawing used to label and explain how something works.
• C. Found in the back of the book and gives an alphabetical listing of names and topics along with page numbers where they are discussed.
• D. Gives information regarding what the passage will be about.

Answer: (B)

A diagram is a drawing used to label and explain how something works. It helps you see parts, how they relate to each other, and the steps in a process, making complex ideas easier to understand. In science and technical texts, diagrams illustrate components of a machine, circuit, or natural process so you can grasp how it functions without relying only on text. The other descriptions refer to features like a subheading, an index, or a preview of the topic, which are not diagrams.