Find the Cofactor of the Indicated Element $\text { a11 }$

Multiple Choice

Find the cofactor of the indicated element.
- $\text { a11 }$
$\left|\begin{array}{rrr}-1 & 0 & 2 \\2 & 2 & 4 \\2 & 5 & 1\end{array}\right|$

A) 6
B) 18
C) $- 18$
D) $- 2$