$z$ and $\omega$ are two non zero complex numbers such that $\mid z\mid=\mid \omega\mid$ and $arg(z)+arg(\omega)=\pi$.Then $z$ equals

Question

$\begin{array}{1 1}(A) \omega \\ (B) \bar{\omega} \\ (C) - \omega \\(D) - \bar{\omega} \end{array}$