Which four typography considerations affect legibility in UI?

• A. Number of fonts, page layout grid, border radius, and animations.
• B. Font weight, background image, gradient, and column width.
• C. Line height, color/contrast, letter spacing, and font tracking.
• D. Font choice, font size, line height, and color/contrast.

Answer: (D)

When you’re aiming for legibility in UI typography, four elements directly control how easy it is to read text: the font you choose, the text size, the line height, and the color/contrast between text and its background. The font choice matters because letter shapes differ in readability; clean, simple sans‑serif or highly legible typefaces are typically used for UI body text, while overly decorative fonts can hinder quick recognition. Font size sets how large the text appears on various devices, so text should be large enough to read without strain and scale appropriately for mobile and desktop. Line height determines the vertical spacing between lines; proper breathing room prevents lines from running together, which makes reading smoother. Color/contrast ensures there’s enough difference between the text and its background, meeting accessibility guidelines so text remains readable in different lighting conditions and for readers with vision impairments. Other visual effects like multiple fonts, background images, gradients, or layout choices may influence perceived readability but don’t directly govern legibility in the same focused way as font choice, size, line height, and color/contrast.