$\int \frac{x^4+x^2+1}{x^2-x+1} dx =$
- A$\frac{1}{3} x^3 + \frac{1}{2} x^2 + x + c$
- B$\frac{1}{3} x^3 - \frac{1}{2} x^2 + x + c$
- C$\frac{1}{3} x^3 + \frac{1}{2} x^2 - x + c$
- D$\frac{1}{3} x^3 - \frac{1}{2} x^2 - x + c$
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