$A$ merry-go-round rotating at a constant angular speed completes $9$ rotations in $18$ seconds. What is its angular speed?

  • A
    $\pi / 2 \text{ rad/s}$
  • B
    $\pi \text{ rad/s}$
  • C
    $2\pi \text{ rad/s}$
  • D
    $3\pi \text{ rad/s}$

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