(x^3y^3 + x^2y + x^3 + xy) + (2x^3y^3 + 2xy - 6y - x^2y) Which of the following is equivalent to the expression above?

(A) 2x3y3 - 3y3 + 5xy - x3

(B) 3x3y3 - 3x3 + 6xy + 5x2

(C) 3x3y3 + x3 + 3xy - 6y

(D) x3y3 - 3x2 + 5xy + 3y3

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