Perform the Indicated Operation $\frac { x ^ { 2 } + x } { 3 } \cdot \frac { 9 } { x + 1 }$

Multiple Choice

Perform the indicated operation. Simplify if possible.
- $\frac { x ^ { 2 } + x } { 3 } \cdot \frac { 9 } { x + 1 }$

A) $3 x ^ { 2 }$
B) $\frac { 3 x ^ { 2 } + 3 x } { x + 1 }$
C) $\frac { x } { 3 }$
D) $3 x$