Find the Determinant of the Matrix $$\left[ \begin{array} { c c } - 4 & 0 \\5 & 8\end{array} \right]$$

Multiple Choice

Find the determinant of the matrix.​ $$\left[ \begin{array} { c c } - 4 & 0 \\5 & 8\end{array} \right]$$ ​

A) 32
B) $- 32$
C) $- \frac { 1 } { 32 }$
D) 0
E) $\frac { 1 } { 32 }$