Simplify the following expression.
2x + 3x³ -5x² + x² +7x+1+7x5 -3x³-4
A. 9x - 4x +7x+5
B. 9x5 +6x +7x+3
C. 5x5 +5x +7x-3
D. 9x - 4x +7x-3