If $(1 + x)^n = C_0 + C_1x + C_2x^2 + .......... + C_nx^n$,then $\frac{C_1}{C_0} + \frac{2C_2}{C_1} + \frac{3C_3}{C_2} + .... + \frac{nC_n}{C_{n - 1}} = $
- A$\frac{n(n - 1)}{2}$
- B$\frac{n(n + 2)}{2}$
- C$\frac{n(n + 1)}{2}$
- D$\frac{(n - 1)(n - 2)}{2}$
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