If the expansion in powers of $$x$$ of the function $$\dfrac{1}{(1 - ax)(1 - bx)}$$ is $$a_0 + a_1x + a_2x^2 + a_3x^3 + \cdots$$, then $$a_n$$ is

A

$$\dfrac{b^n - a^n}{b - a}$$

B

$$\dfrac{a^n - b^n}{b - a}$$

C

$$\dfrac{a^{n+1} - b^{n+1}}{b - a}$$

D

$$\dfrac{b^{n+1} - a^{n+1}}{b - a}$$