Compute the Determinant of the Matrix by Cofactor Expansion $$\left[ \begin{array} { r r r } 1 & 2 & 5 \\4 & 8 & 12 \\- 2 & 3 & - 1\end{array} \right]$$

Multiple Choice

Compute the determinant of the matrix by cofactor expansion.
- $$\left[ \begin{array} { r r r } 1 & 2 & 5 \\4 & 8 & 12 \\- 2 & 3 & - 1\end{array} \right]$$

A) 14
B) 56
C) $- 28$
D) 28