Two wires $A$ and $B$ of same material have radii in the ratio $2: 1$ and lengths in the ratio $4: 1$. The ratio of the normal forces required to produce the same change in the lengths of these two wires is .......

  • A

    $1: 1$

  • B

    $2: 1$

  • C

    $1: 2$

  • D

    $1: 4$

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