Select the correct answer.
Which expression is equivalent to this polynomial expression?
(5xy^2 + 3x^2 – 7) + (3x^2y^2 - xy^2 + 3y^2 + 4)

A. 882y2 + 2xy2 – 4y2 + 4
B. 3x2y2 + 4xy2 + 3x2 + 3y2 – 3
C. 3x2y2 + 63y2 + 6x2 + 3
D. 9x2y2 + 4xy2 – 3