What instructional aid primarily focuses on visual representation of information?

The correct answer is that printed materials primarily focus on visual representation of information. Printed materials, such as handouts, manuals, charts, and textbooks, provide information in a format that is primarily visual. They allow learners to engage with the content through reading, which is a traditional and effective method of conveying information visually.

While audio/visual materials do include visual components, they also incorporate auditory elements, making their focus broader. Step-by-step guides are structured to provide sequential instructions and while they provide visual aids, they do not exclusively focus on visual representation. Interactive media includes various forms of communication, often involving user engagement and multimedia elements that can go beyond just visual representation. Thus, printed materials are characterized specifically by their reliance on visual information presentation.