Which approach improves readability of text labels in visualizations?

• A. Use small font sizes
• B. Use diagonally oriented labels in all cases
• C. Orient labels for easy reading
• D. Hide labels

Answer: (C)

Reading labels clearly is boosted when you orient text so it’s easy to read. Keeping labels oriented for easy reading—typically horizontal and upright—lets eyes move naturally across the chart, recognizes letters quickly, and reduces cognitive load. This makes the information conveyed by the labels faster to understand and less frustrating to read, especially when charts are dense or viewed at a glance. If you tilt labels or rotate them, you increase the effort needed to read, which can slow interpretation and cause misreads. Small font sizes further reduce legibility, and hiding labels eliminates essential context. Diagonal or angled labels aren’t inherently wrong in some cases, but applying them in all situations usually hurts readability more than it helps. So orienting labels for easy reading is the most reliable way to improve readability in visualizations.