This question tests the ability to include multimedia components in presentations to enhance main ideas or themes (CCSS.SL.5.5). Students must understand that effective multimedia serves specific purposes: making concepts visual, providing evidence, creating connections, demonstrating processes, or emphasizing key information. Timeline graphics excel at showing sequence, cause-and-effect relationships, and how events build upon each other over time. They make historical progression visual and help audiences understand how change develops through connected actions. In this presentation about the Civil Rights Movement, Maya emphasized the theme of how nonviolent actions built change over time. Maya included a timeline graphic that organized key events in order, helping students see how nonviolent actions accumulated to create social change. The timeline served a specific purpose: it made the progression of the movement visual, showing how each action contributed to building momentum. Choice A is correct because it accurately explains how the timeline graphic developed Maya's main idea by organizing events chronologically, revealing how nonviolent actions built change progressively over time. This demonstrates understanding that timelines show sequence and development, not just dates. Choice B represents the error of wrong media type attribution—confusing what different multimedia does best. Students who choose this may think timelines play audio, not recognizing that timelines organize visual information while audio provides sound. To help students use multimedia effectively: Teach that timelines show progression—how events connect, build on each other, and create change over time. Practice reading timelines for patterns: 'See how each protest led to the next? That's the building effect.' Model thinking: 'My theme is gradual change through nonviolent action. A timeline shows how sit-ins led to freedom rides led to marches—each building on the last.' Create timeline analysis questions: What patterns do you see? How did early events influence later ones? What does the spacing tell you about momentum?