The value of $\int_{ - a}^a {\frac{1}{{x + {x^3}}}} dx$ is
- A$0$
- B$\int_0^a {\frac{1}{{1 + {x^6}}}} dx$
- C$2\int_0^a {\frac{1}{{1 + {x^3}}}} dx$
- D$\int_0^a {\frac{1}{{1 + {{(a - x)}^3}}}} dx$
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