Simplify the Algebraic Expression $$5 x + 4 y - 9 x + 9 y$$

Simplify the algebraic expression.
- $$5 x + 4 y - 9 x + 9 y$$

A) $- 4 x + 13 y$
B) $13 x - 4 y$
C) $5 x - 9 x + 4 y + 9 y$
D) $9 x y$