An object suspended by a wire stretches it by $10 \,mm$. When object is immersed in a liquid the elongation in wire reduces by $\frac{10}{3} \,mm$. The ratio of relative densities of the object and liquid is ............

  • A

    $3: 1$

  • B

    $1: 3$

  • C

    $1: 2$

  • D

    $2: 1$

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