In $\odot( O , r),$ the length of minor $\widehat{ ACB }$ is $\frac{1}{6}$ times the circumference of the circle. Then, the measure of the angle subtended at the centre by minor $\widehat{ ACB }$ is .........

  • A

    $30$

  • B

    $60$

  • C

    $90$

  • D

    $120$

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