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设 $W_0=\sqrt[8]{2}\left(\cos \frac{\pi}{16}+i \sin \frac{\pi}{16}\right)$ ，则 $1+i$ 的四次方根为
A. $\quad w_0, 2 w_0, 3 w_0, 4 w_0$     B. $W_0, W_0^2, W_0^3, W_0^4$     C. $\quad w_0, i w_0, i^2 w_0, i^3 w_0$     D. $\quad w_0, i w_0,-i^2 w_0,-i^3 w_0$         
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