8. The following rational expressions are proper fractions except: x + 2x³-3x²+x-5 3x² - 4 C. x²(x+2) x²(x²-3x - 1)(x+2) (x²-3x - 1)(x²+2) x² (x-3)³ A. B. D. x(x-3) x² + 3x³ + 2x²

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