若一無窮等比級數之和是一正數$$S$$，且級數的第$$2$$项是$$1$$，則$$S$$的最小可能値爲何？  The sum of an infinite geometric series is a positive number S, and the second tern in the series is $$1$$. What is  the smallest possible value of $$S$$?
选项为:A:$$ \frac{1+ \sqrt{5}}{2} $$  B:$$2$$  C:$$ \sqrt{5} $$  D:$$3$$  E:$$4$$  请回答其中一个选项.