Compute the Determinant of the Matrix by Cofactor Expansion $$\left[ \begin{array} { r r r r } 2 & - 2 & 6 & 4 \\2 & 2 & 7 & 1 \\6 & - 6 & 13 & 14 \\- 2 & 2 & - 6 & 2\end{array} \right]$$

Compute the determinant of the matrix by cofactor expansion.
- $$\left[ \begin{array} { r r r r } 2 & - 2 & 6 & 4 \\2 & 2 & 7 & 1 \\6 & - 6 & 13 & 14 \\- 2 & 2 & - 6 & 2\end{array} \right]$$

A) -60
B) $- 240$
C) 120
D) $- 120$