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行列式 $\left|\begin{array}{llll}0 & a & b & 0 \\ a & 0 & 0 & b \\ 0 & c & d & 0 \\ c & 0 & 0 & d\end{array}\right|=$
A. $(a d-b c)^2$     B. $-(a d-b c)^2$     C. $a^2 d^2-b^2 c^2$     D. $b^2 c^2-a^2 d^2$         
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