The sum of the series $aC_0 + (a + b)C_1 + (a + 2b)C_2 + \dots + (a + nb)C_n$ is,where $C_r$ denotes the combinatorial coefficient in the expansion of $(1 + x)^n, n \in N$.
- A$(a + 2nb)2^n$
- B$(2a + nb)2^n$
- C$(a + nb)2^{n - 1}$
- D$(2a + nb)2^{n - 1}$
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