9514 1404 393
Answer:
A (as marked)
Explanation:
It often works well to eliminate the answer choices that can't be right.
The constant term of the sum must be ...
-7 + 4 = -3 . . . . . eliminates choices B and D
The highest-degree term of the sum must be ...
( ) +(3x^2y^2) = 3x^2y^2 . . . . eliminates choice C
The remaining viable choice is A. Checking the sum term by term, you find A is the correct choice.
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The only terms that combine are the xy^2 terms and the constants.