Which color combination is commonly challenging for accessibility?

• A. Red and green
• B. Blue and yellow
• C. Black and white
• D. Orange and violet

Answer: (A)

Color accessibility revolves around making sure information isn’t conveyed by color alone so people who can’t distinguish certain hues still understand it. Red and green is commonly challenging because red-green color vision deficiency is the most common form of color blindness, so many people have trouble telling these two apart. That makes signals, status indicators, or charts that rely on red and green hard to interpret for a sizable portion of users, especially when color is the only cue. To design accessibly, pair color with other cues like labels, icons, or patterns, and ensure sufficient contrast so information remains clear even if color differences aren’t perceived. Black and white usually offers strong contrast, blue and yellow are often distinguishable for most color-vision deficiencies, and while orange and violet can pose issues for some, they’re not as universally problematic as red and green.