Solve the Equation $$( x + 2 ) ( x - 1 ) = ( x + 1 ) ^ { 2 }$$

Solve the equation.
- $$( x + 2 ) ( x - 1 ) = ( x + 1 ) ^ { 2 }$$

A) $\{ - 2 \}$
B) $\{ - 3 \}$
C) $\left\{ \frac { 3 } { 2 } \right\}$
D) $\{ 3 \}$