Find the Cofactor of the Indicated Element $\left| \begin{array} { r r r } 1 & 2 & 3 \\ - 3 & 0 & 1 \\ 5 & 3 & 3 \end{array} \right|$

Multiple Choice

Find the cofactor of the indicated element.
-a 21
$\left| \begin{array} { r r r } 1 & 2 & 3 \\ - 3 & 0 & 1 \\ 5 & 3 & 3 \end{array} \right|$

A) $- 7$
B) $- 3$
C) 3
D) 7