大全sec5-17,谢谢

17. Native American burial sites dating back 5,000 years indicate that the residents of Maine at that time were part of a widespread culture of Algonquian-speaking people.
(A) were part of a widespread culture of Algonquian-speaking people
(B) had been part of a widespread culture of people who were Algonquian-speaking
(C) were people who were part of a widespread culture that was Algonquian-speaking
(D) had been people who were part of a widespread culture that was Algonquian-speaking
(E) were a people which had been part of a widespread, Algonquian-speaking culture

答案是a,这里 residents是人，而a后面的中心词是culture，不就变成人是文化了吗
c为什么不对？

有人问过同样的问题  你去搜搜看咯