Simplify Assume That Variables in the Exponent Represent Nonzero Integers $\frac { 12 x ^ { 6 } a + b y 4 a - b } { - 3 x ^ { a } + 5 b _ { y } a - 2 b }$

Multiple Choice

Simplify. Assume that variables in the exponent represent nonzero integers and that all other variables are not 0.
- $\frac { 12 x ^ { 6 } a + b y 4 a - b } { - 3 x ^ { a } + 5 b _ { y } a - 2 b }$

A) $-4 x^{5} a-4 b_{y}^{3 a-3 b}$
B) $4 x ^ { 5 } a - 4 b y ^ { 3 a + b }$
C) $- 4 x ^ { 5 } a - 4 b _ { y } ^ { 3 a } + b$
D) $-4 x^{5 a}+6 b_{y} 3 a+b$