A weight $M g$ is suspended from the middle of a rope whose ends are at the same level. The rope is no longer horizontal. The minimum tension required to completely straighten the rope is ......

  • A

    $\frac{M g}{2}$

  • B

    $M g \cos \theta$

  • C

    $2 M g \cos \theta$

  • D

    Infinitely large

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