What is 7x2 - 4 + 6x3 - 4x - X4 in standard form?

A 4 - 4x + 7x2 + 6x3 – X4

B. 46-4 - x) + x2(7 + 6x - x2)
C. X4 + 6x3 + 7x2 - 4x - 4
D. –X4 + 6x3 + 7x2 - 4x - 4
Help ASAP