Visual means...

• A. Capable of being seen with one's naked eye
• B. Related to sight
• C. Relating to things that can be seen
• D. Colorful or bright

Answer: (C)

Visual relates to sight and to what can be seen. It’s used to describe things connected with seeing or shown in a way you can perceive with the eyes. That makes the option about relating to things that can be seen the best fit, because it captures how we use visual to refer to the content or objects visible to us—images, diagrams, visual aids, and other seen materials.

Think of how you encounter visual information: visuals, visual cues, visual art. They all center on what is seen. The other options pull in a different direction—capable of being seen points to something visible, which is a separate word; colorfulness describes appearance, not the relation to sight; and while related to sight, the phrase “related to sight” is broader and doesn’t emphasize the seen objects in the same way.