Which expression is equivalent to [tex](5x^7 + 7x^8) - (4x^4 - 2x^8)[/tex]?

A. [tex]3x^8 + 7x^7[/tex]
B. [tex]9x^8 + 5x^7 - 4x^4[/tex]
C. [tex]5x^8 + 5x^7 + 4x^4[/tex]
D. [tex]12x^8 - 2x^4[/tex]