等质量的水、氢气、硫酸中都含有相同的（　　）

A．氢分子

B．氢原子个数

C．氢元素

D．氢元素质量分数

It is few people, _____ have come to ask for the position, ____ fit for the job. [ ]

A. who; who do I think is

B. that; I think is

C. that; who I think are

D. who; that I think are