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\( \arg (\bar{z})+\arg (-z)=\left\{\begin{array}{ll}\pi, & \text { if } \arg (z)0 \\ -\pi, & \text { if } \arg (z)0\end{array}\right. \), where \( -\pi\arg (z) \leq \pi \)
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If \( \arg \left(4 z_{1}\right)-\arg \left(5 z_{2}\right)=\pi \), then \( \left|\frac{z_{1}}{z_{2}}\right| \) is equal to
(a) 1
(b) \( 1.25 \)
(c) \( 1.50 \)
(d) \( 2.50 \)
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