Which polynomial is equivalent to (x^2-6x^4+4x^3-2x)+(4x-5x^2+4x^3-6x^4)
A. -4x^2+2x
B. -x^4+8x^3-4x^3-2x
C. -x^3-2x^2-2x
D. -12x^4+8x^3-4x^+2x
E. -12x^4-x^3-2x^2-6x