Mark the tick against the correct answer in the following:

Mark the tick against the correct answer in the following:

If $\left|\begin{array}{ccc}5 & 3 & -1 \\ -7 & x & 2 \\ 9 & 6 & -2\end{array}\right|=0$ then $x=?$

A. 0

B. 6

C. $-6$

D. 9