If $S_n = \sum_{r=0}^n \frac{1}{^nC_r}$ and $T_n = \sum_{r=0}^n \frac{r}{^nC_r}$,then $\frac{T_n}{S_n}$ is equal to
- A$\frac{n}{2}$
- B$\frac{n}{2} - 1$
- C$n - 1$
- D$\frac{2n - 1}{2}$
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