Which polynomial is equivalent to (x^3+2x^4+5x^5-2x-1)-(-7x-x^2+9x^3+2x^4)?
A. 5x^5+10x^3+x^2-9x-1
B. 5x^5-8x^3+x^2+5x-1
C. 5x^5-8x^3+x^2+5x+1
D. 5x^5+4x^4+10x^3+x^2-9x-1
E. 5x^5-4x^4-8x^3+x^2+5x+1