If \( z_{1} \) and \( z_{2} \) are two \( n^{\text {th }} \) roots of unity, then \( \arg \left(...

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If \( z_{1} \) and \( z_{2} \) are two \( n^{\text {th }} \) roots of unity, then \( \arg \left(\frac{z_{1}}{z_{2}}\right) \) is a multiple of
(A) \( n \pi \)
(B) \( \frac{3 \pi}{n} \)
(C) \( \frac{2 \pi}{n} \)
(D) none of these
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