Simplify (8x^2 - 1 + 2x^3) - (7x^3 - 3x^2 + 1).

A.-5x^3 + 11x^2 - 2

B. 5x^3 - 11x^2 + 2

C. x^3 + 2x^2 + x^3

D. x^3 - 2x^2 - x^3

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