If $5 + ix^3y^2$ and $x^3 + y^2 + 6i$ are conjugate complex numbers and $\arg(x + iy) = \theta$,then $\tan^2 \theta$ is equal to

  • A
    $4$
  • B
    $5$
  • C
    $6$
  • D
    $7$

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