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If `S_(n) = underset (r=0) overset( n) sum (1) /(""^(n) C_(r))` and `T_(n) = underset(r=0) overset(n) sum (r )/(""^(n) C_(r))` then ` (t_(n))/(s_(n))` =

A

`1/2 n`

B

`(2n-1)/(2)`

C

`n-1`

D

`1/2 n-1`

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The correct Answer is:
A
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