Find the Cofactor of the Indicated Element $\mathrm{a}_{21}$ $\left|\begin{array}{rrr}5 & 2 & 1 \\-3 & 0 & 1 \\1 & 5 & 2\end{array}\right|$

Multiple Choice

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

A) -1
B) 1
C) -23
D) 23