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) $\frac { 1 } { 32 }$