Which principle asserts that text should be legible and easy on the eyes?

• A. Visibility
• B. Simplicity
• C. Contrast
• D. Accessibility

Answer: (A)

Making content easily perceivable is central here, especially when it comes to text readability. A UI principle emphasizes that information shown to users must be visible; that includes font size, spacing, and sufficient contrast so text is legible and easy on the eyes. When text is clearly visible, users can scan and comprehend content without strain, which is the core goal of visibility in interface design. Simplicity helps reduce clutter so content can be perceived; contrast deals specifically with color differences that separate elements; accessibility broadens reach to users with disabilities. But visibility directly addresses the ease with which text and other critical content can be seen, which is why this choice best captures the focus on legibility.