If $S$ is the sum to infinity of a $G.P.$,whose first term is $a$,then the sum of the first $n$ terms is
- A$S(1 - \frac{a}{S})^n$
- B$S[1 - (1 - \frac{a}{S})^n]$
- C$a[1 - (1 - \frac{a}{S})^n]$
- DNone of these
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