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If \( \alpha_{1}, \alpha_{2}, \alpha_{3}, \ldots \ldots ., \alpha_{n-1} \) are the imaginary \( n^{\text {th }} \) roots of unity then the product \( \prod_{\mathrm{r}=1}^{\mathrm{n}-1}\left(\mathrm{i}-\alpha_{\mathrm{r}}\right) \)
\( \mathrm{P} \) (where \( \mathrm{i}=\sqrt{-1} \) ) can take the value equal to

W
(A) 0
(B) 1
(C) \( \mathrm{i} \)
(D) \( (1+\mathrm{i}) \)
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