If $\operatorname{cosec} \theta - \sin \theta = m$ and $\sec \theta - \cos \theta = n$,then $(m^2 n)^{2/3} + (m n^2)^{2/3} = $

  • A
    $-1$
  • B
    $1$
  • C
    $0$
  • D
    None of these

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