If $z=x+iy$ and $z^{1/3}=p+iq$,where $x, y, p, q \in R$ and $i=\sqrt{-1}$,then the value of $\left(\frac{x}{p}+\frac{y}{q}\right)$ is

  • A
    $p^2-q^2$
  • B
    $4(p^2-q^2)$
  • C
    $p^2+q^2$
  • D
    $4(p^2+q^2)$

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