Option C. i believe
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(the parentheses can be removed without changing any signs because the sign outside them is positive)
Bringing like terms together:-
= x^4 + 2x^3 - x^3 + 3x^2 + 3x^2 - x + 4x + 2 + 2
= x^4 + x^3 + 6x^2 + 3x + 4 which is choice A.
