Which expression is equivalent to (x – 1)7?

A)
x7 – 7x6 – 21x5 – 35x4 – 35x3 – 21x2 – 7x – 1


B)
x7 – 7x6 + 21x5 – 35x4 + 35x3 – 21x2 + 7x – 1


C)
x7 – 8x6 – 28x5 – 56x4 – 56x3 – 28x2 – 8x – 1


D)
x7 – 8x6 + 28x5 – 56x4 + 56x3 – 28x2 + 8x – 1