Subtract the Polynomials and Simplify $$\left( - 3 r ^ { 2 } - 2 r - 4 \right) - \left( - 9 r ^ { 2 } + 7 r + 2 \right)$$

Multiple Choice

Subtract the polynomials and simplify. $$\left( - 3 r ^ { 2 } - 2 r - 4 \right) - \left( - 9 r ^ { 2 } + 7 r + 2 \right)$$

A) $- 12 r ^ { 2 } + 5 r - 2$
B) $6 r ^ { 2 } - 9 r - 6$
C) $6 r ^ { 2 } - 2 r ^ { 2 } - 7 r - 6$
D) $6 r ^ { 2 } + 5 r - 2$