Which operation is NOT closed for polynomials?
A) - (x2 + 4x + 5) (8x2 + 3x + 4)
B) (7x2 + 2x + 3) + (3x2 - 5x + 4)
C) (x2 + 2x + 5) - (x2 - 2x + 9)
D) (x3 + 4x - 5) / (x5 - 2x + 2)
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