Use Graphical Methods to Find Any Turning Points of the Graph

Multiple Choice

Use graphical methods to find any turning points of the graph of the function.
- $$y = \frac { x + 1 } { x ^ { 2 } + 3 x + 3 }$$

A) No turning points
B) $\left( 0 , \frac { 1 } { 3 } \right)$ and $( - 2 , - 1 )$
C) $( 0,3 )$ and $\left( - 2 , \frac { 1 } { 3 } \right)$
D) $\left( 0 , - \frac { 1 } { 3 } \right)$ and $( - 2,1 )$