To determine the sum of the polynomials
[tex]\begin{gathered} 3a^2b+2a^2b^2,-ab^2+a^2b^2 \\ \\ \end{gathered}[/tex][tex]\begin{gathered} 3a^2b+2a^2b^2+\text{ -}ab^2+a^2b^2 \\ 3a^2b+2a^2b^2-\text{ }ab^2+a^2b^2 \\ \text{collect like terms} \\ 3a^2b-ab^2+2a^2b^2+a^2b^2 \\ 3a^2b-ab^2+3a^2b^2 \end{gathered}[/tex]Hence the correct answer is Option A
