Simplify the Expression $$\left( 20 z ^ { 2 } + 10 z + 6 \right) + \left( 9 z ^ { 2 } + 9 z + 1 \right)$$

Multiple Choice

Simplify the expression. $$\left( 20 z ^ { 2 } + 10 z + 6 \right) + \left( 9 z ^ { 2 } + 9 z + 1 \right)$$

A) $29 z ^ { 2 } + 10 z + 7$
B) $29 z ^ { 2 } + 19 z + 7$
C) $29 z ^ { 2 } + 19 z$
D) $20 z ^ { 2 } + 19 z + 7$
E) none of these