The ratio of lengths of two rods $A$ and $B$ of the same material is $1:2$ and the ratio of their radii is $2:1$. What is the ratio of the modulus of rigidity of $A$ and $B$ (in $:1$)?

  • A
    $4$
  • B
    $16$
  • C
    $8$
  • D
    $1$

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