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$(n+1) 2^{n-1}$
- C$(n+2) 2^n$
- D$(n+1) 2^n$
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