If A,B and C are angles of a triangle ,then the determinant$\begin{vmatrix}1 & \cos C & \cos B\\\cos C & 1 & \cos A\\\cos B & \cos A & 1\end{vmatrix}$ is equal to

Question

$\begin{array}{1 1}(A)\quad 0 & (B)\quad -1\\(C)\quad 1 & (D)\quad None\;of\;these\end{array}$