Discussion
Designing a map so that it remains readable for colour-blind users is best achieved by
Answer: A
Correct answer: varying value as well as hue between classes
If the classes differ in lightness as well as in colour, they remain distinguishable to a reader who cannot separate the hues, and they survive photocopying too. Adding more hues makes the problem worse by crowding the space, raising saturation does not help someone who cannot perceive the difference, and enlarging the map changes nothing about colour.
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