What Were the Conclusions Made from Robert Dahl and His

What were the conclusions made from Robert Dahl and his graduate students' study of New Haven, Connecticut?

A) Communities tend to have a fixed elite, with only occasional changes.
B) There is no permanent elite in a community, but rather a shifting coalition of leaders.
C) There is no difference between the economic elite and the social elite in a community; they are the same people.
D) The elite of a community is hereditary; if your father or mother was a member of the elite, then you would be as well.
E) Business interests control who will become a member of a community's elite.