A legend serves as a reference that maps the visual cues—like colors, line styles, or symbols—to the data series in a chart. When multiple series are shown, the legend tells you which color or marker corresponds to which dataset, so you can interpret trends and comparisons correctly. Without it, you might confuse lines or bars and misread the chart. Legends are about clarity and readability, not decoration or performance, which is why the correct choice describes that it clarifies which data series is which.

Typing information means entering text into the computer, and the keyboard is the device built for that task. It’s an input tool that lets you input letters, numbers, and symbols by pressing keys, sending those characters to the computer to be processed. The mouse is for pointing and selecting, the monitor displays what’s happening, and the speaker outputs sound. Because entering text is precisely what the keyboard is designed to do, it’s the best answer.

Verifying facts before posting is the best way to prevent defamatory content on social media. When you share information online, you’re passing it along to others, and if it’s false or taken out of context, you can harm someone’s reputation and expose yourself to consequences. To reduce this risk, take a moment to check what you’re about to share: look for information from reliable, reputable sources, and seek confirmation from more than one credible outlet or the original, primary source if possible. Pay attention to dates, quotes, and the full context; if something can’t be verified, it’s safer not to post it or to clearly indicate uncertainty. Focus on sharing only confirmed facts and avoid spreading rumors or unverified statements. Reposting rumors from chat tends to amplify untruths and can lead to defamatory impacts. Writing personal attacks directly harms individuals and crosses into defamation. Ignoring guidelines opens the door to unsafe content and policy violations.

The main idea here is the difference between passively receiving sound and actively processing it. Hearing is the automatic, physiological process of detecting sound waves with the ears. It happens without deliberate effort and doesn’t require attention. Listening, on the other hand, is active; it means you intentionally focus on sound, pay attention, and interpret or understand what is being heard. Perception involves interpreting sensory information, which can include sounds but goes beyond the mere act of sensing. Awareness is a broad term for being conscious or noticing things in general, not specifically about the ear’s ability to receive sound. So the term that best describes passive awareness of sound is hearing.