The cylindrical tube of a spray pump has radius $R,$ one end of which has $n$ fine holes,each of radius $r.$ If the speed of the liquid in the tube is $v,$ the speed of the ejection of the liquid through the holes is

  • A
    $\frac{v^2 R}{n r}$
  • B
    $\frac{v R^2}{n^2 r^2}$
  • C
    $\frac{v R^2}{n r^2}$
  • D
    $\frac{v R^2}{n^3 r^2}$

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