Find the Least Common Denominator of the Rational Expressions $\frac { 15 } { x ^ { 2 } + 2 x - 15 }$

Multiple Choice

Find the least common denominator of the rational expressions.
- $\frac { 15 } { x ^ { 2 } + 2 x - 15 }$ and $\frac { 4 x - 20 } { - 4 x - 20 }$

A) $- 4 ( x - 3 ) ( x - 5 )$
B) $- 4 ( x - 3 ) ( x + 5 )$
C) $- 4 ( x + 3 ) ( x - 5 )$
D) $- 4 ( x + 3 ) ( x + 5 )$