$\left( \frac{a - b}{a} \right) + \frac{1}{2} \left( \frac{a - b}{a} \right)^2 + \frac{1}{3} \left( \frac{a - b}{a} \right)^3 + \dots = $
- A$\log_e(a - b)$
- B$\log_e \left( \frac{a}{b} \right)$
- C$\log_e \left( \frac{b}{a} \right)$
- D$e^{\left( \frac{a - b}{a} \right)}$
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