If $A=\{3, 6, 9, 12, 15, 18, 21\}, B=\{4, 8, 12, 16, 20\}, C=\{2, 4, 6, 8, 10, 12, 14, 16\}, D=\{5, 10, 15, 20\};$ find $A-C$.

  • A
    $\{3, 9, 15, 18, 21\}$
  • B
    $\{3, 6, 9, 15, 18, 21\}$
  • C
    $\{3, 6, 15, 18, 21\}$
  • D
    $\{9, 15, 18, 21\}$

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