Add or Subtract as Indicated $$\left( 7 x ^ { 7 } + 19 x ^ { 6 } - 6 \right) - \left( 6 x ^ { 6 } + 2 x ^ { 7 } + 4 \right)$$

Multiple Choice

Add or subtract as indicated. Express the answer as a single polynomial in standard form.
- $$\left( 7 x ^ { 7 } + 19 x ^ { 6 } - 6 \right) - \left( 6 x ^ { 6 } + 2 x ^ { 7 } + 4 \right)$$

A) $5 x ^ { 7 } + 13 x ^ { 6 } - 2$
B) $5 x ^ { 7 } + 21 x ^ { 6 } - 2$
C) $5 x ^ { 7 } + 13 x ^ { 6 } - 10$
D) $8 x ^ { 13 }$