$\text { Find the integral } \int \frac { x - 15 } { x ^ { 2 } + 1 } d x \text {. }$

Multiple Choice

$\text { Find the integral } \int \frac { x - 15 } { x ^ { 2 } + 1 } d x \text {. }$

A) $15 \ln \left( x ^ { 2 } + 1 \right) - \arctan ( x ) + C$
B) $\frac { 1 } { 15 \ln \left( x ^ { 2 } + 1 \right) } - 15 \arctan ( x ) + C$
C) $\frac { 1 } { 2 \ln \left( x ^ { 2 } + 1 \right) } + 15 \arctan ( x ) + C$
D) $\frac { 1 } { 2 } \ln \left( x ^ { 2 } + 1 \right) - 15 \arctan ( x ) + C$
E) $2 \ln \left( x ^ { 2 } + 1 \right) - 15 \arctan ( x ) + C$