If S is the sum of the reciprocals of the consecutive integers from 91 to 100, inclusive, which of the following is less than S? I. 1/8 II.1/9 III. 1/10
A. None, B, I only, C, III only, D, II and III only, E, I, II, and III 正确答案是C,可我没什么思路,请牛牛们指点指点吧。多谢!