If $f(x) = 1 + nx + \frac{n(n-1)}{2} x^{2} + \frac{n(n-1)(n-2)}{6} x^{3} + \ldots + x^{n}$,then $f^{\prime \prime}(1)$ is equal to
- A$n(n-1) 2^{n-1}$
- B$(n-1) 2^{n-1}$
- C$n(n-1) 2^{n-2}$
- D$n(n-1) 2^{n}$
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