Add or Subtract as Indicated $$\left( 6 x ^ { 2 } + 7 x - 8 \right) + \left( 4 x ^ { 2 } + 6 x + 3 \right)$$

Multiple Choice

Add or subtract as indicated. Express the answer as a single polynomial in standard form.
- $$\left( 6 x ^ { 2 } + 7 x - 8 \right) + \left( 4 x ^ { 2 } + 6 x + 3 \right)$$

A) $10 x ^ { 2 } + 13 x - 5$
B) $10 x ^ { 2 } + 13 x + 5$
C) $- 4 x ^ { 2 } + 12 x + 10$
D) $10 x ^ { 2 } - 13 x - 5$