Subtract the Polynomials $\left( 9 x ^ { 6 } - 6 x ^ { 5 } + 15 x \right) - \left( 2 x ^ { 6 } + 12 x ^ { 5 } + 19 x \right)$

Multiple Choice

Subtract the polynomials. Assume all variable exponents represent whole numbers.
- $\left( 9 x ^ { 6 } - 6 x ^ { 5 } + 15 x \right) - \left( 2 x ^ { 6 } + 12 x ^ { 5 } + 19 x \right)$

A) $7 x ^ { 6 } - 4 x ^ { 5 } + 34 x$
B) $7 x ^ { 6 } - 18 x ^ { 5 } - 4 x$
C) $- 15 x ^ { 12 }$
D) $7 x ^ { 6 } - 18 x ^ { 5 } + 34 x$