If $(1+x)^n = C_0 + C_1 x + C_2 x^2 + \ldots + C_n x^n$,then $C_0 + 2 C_1 + 3 C_2 + \ldots + (n+1) C_n$ is equal to
- A$(n+2) 2^{n-1}$
- B$2^{n-1} + n \cdot 2^n$
- C$2^n + (n+1) 2^n$
- D$2^{n-1} + (n-1) 2^n$
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