Rút gọn phân thức

Câu hỏi: Rút gọn phân thức $\frac{{{\text{(a}}^{\text{4}}-{\text{b}}^{\text{4}}\text{)}}^{\text{3}}}{\text{(b}+{\text{a)(a}}^{\text{2}}+{\text{b}}^{\text{2}}\text{)(a}-{\text{b)}}^{\text{3}}}$  ta được?

A. $\frac{{\text{(a}}^{\text{2}}+{\text{b}}^{\text{2}}\text{)(a}+\text{b)}}{\text{a}-\text{b}}$

B. $\frac{{\text{a}}^{\text{2}}+{\text{b}}^{\text{2}}}{\text{a}-\text{b}}$

C. ${\left(a^2 + b^2\right)}^2{\left(a + b\right)}^2$

D. $(a^2 + b^2)(a + b)$