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Assertion (A): A series of small multiples showing successive years must share one classification scheme.
Reason (R): A tone can only be compared between maps if it stands for the same range on each.

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

Answer: A

Correct answer: Both A and R are true, and R is the correct explanation of A

Both are true and the reason is exactly why. If each year were classified on its own data, the same tone would mean a different range on each panel, and a district appearing to darken over time might in fact have held steady while the distribution around it shifted. A single classification spanning all years is what makes the comparison honest, even though it leaves some panels using only part of the scale.

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