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Q)

The $z$ is a complex number of unit modulus an argument $\theta$, then $arg \begin{pmatrix}\frac{1+z}{1+ \overline{z}} \end{pmatrix}$ equals

( A ) $-\theta$
( B ) $\pi - \theta$
( C ) $\frac{\pi}{2} -\theta$
( D ) $\theta$