Evaluate the Determinant $$\left| \begin{array} { r r } 3 & 2 \\- 1 & 1\end{array} \right|$$

Evaluate the determinant.
- $$\left| \begin{array} { r r } 3 & 2 \\- 1 & 1\end{array} \right|$$

A) -5
B) 1
C) 5
D) 7