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Assertion (A): A choropleth map should use a sequence of tones rather than a set of unrelated hues.
Reason (R): Value is perceived as ordered, whereas hue is perceived only as different.

  • A.A is false but R is true
  • B.Both A and R are true, and R is the correct explanation of A
  • C.Both A and R are true, but R is not the correct explanation of A
  • D.A is true but R is false

Answer: B

Both statements are true and the reason accounts for the assertion: because the data being shown are ranked, the symbol must be read as ranked too, which a light-to-dark progression achieves and a collection of separate hues does not.

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