Find the Determinant of the Matrix After Introducing Zeros $$\left[ \begin{array} { c c c } 2 & 1 & 0 \\- 6 & 0 & 1 \\1 & 2 & - 1\end{array} \right]$$

Multiple Choice

Find the determinant of the matrix after introducing zeros. $$\left[ \begin{array} { c c c } 2 & 1 & 0 \\- 6 & 0 & 1 \\1 & 2 & - 1\end{array} \right]$$

A) - 9
B) - 8
C) - 10
D) 7
E) 0