The ratio of lengths of two rods $A$ and $B$ of same material is $1 : 2$ and the ratio of their radii is $2 : 1$, then the ratio of modulus of rigidity of $A$ and $B$ will be
  • A$4:1$
  • B$16:1$
  • C$8: 1$
  • D$1:1$
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