Simplify the Rational Expression $\frac { n r - 12 - 4 n + 3 r } { n r + 15 + 3 r + 5 n }$

Multiple Choice

Simplify the rational expression. $\frac { n r - 12 - 4 n + 3 r } { n r + 15 + 3 r + 5 n }$

A) $\frac { r + 4 } { r - 5 }$
B) $- \frac { r + 4 } { r + 5 }$
C) $- \frac { r + 3 } { r + 4 }$
D) $\frac { r - 4 } { r + 5 }$