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Consider the following statements about proportional symbols.
1. Scaling by area is preferable to scaling by radius.
2. Overlapping symbols should always be deleted rather than drawn transparent.
3. A legend should show at least the smallest, a middle and the largest symbol.

  • A.1 only
  • B.All of them
  • C.1 and 3 only
  • D.2 only

Answer: C

The first and third describe standard practice, since area scaling matches perception and a three-value legend lets the reader interpolate. The second is wrong, because deleting symbols removes data, while transparency or outlining preserves it.

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