In the Context of the Structure of American Political Parties

In the context of the structure of American political parties, both major American political parties:

A) are closely knit or highly organized.
B) are fragmented and decentralized.
C) have a central power and a direct chain of command.
D) are fashioned in such a way that a single individual or group can direct all party members.
E) are organized in such a way that all party members are at the same level.