A light string passing over a smooth light pulley connects two block of masses $m_1$ and  $m_2$ (vertically). If the acceleration of the system is $\left( {\frac{g}{8}} \right)$, then the ratio of masses is

  • A

    $8 : 1$

  • B

    $9 : 7$

  • C

    $4 : 3$

  • D

    $5 : 3$

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