Final answer:
The correct answer is C. the factions are defined parts of the group. Factions are subsets of a larger group, united by common interests or beliefs, and play an integral part in the group dynamics.
Step-by-step explanation:
If a group has several factions, what must be true is that C. the factions are defined parts of the group. A faction is a subset of a group, often driven by specific interests or beliefs that may differ from the larger group. A sect, on the other hand, often signifies a split from a larger group to return to important fundamentals or signify a separate group with distinct beliefs. James Madison's definition of factions suggests that they are a collection of individuals, either a majority or minority, joined by a common interest or passion that is sometimes opposed to the collective good of the larger society. Factions can exist as political parties, interest groups, or smaller divisions within any group. While interest groups may have narrower, more specific goals and membership than political parties, they, too, function as factions within the broader context of society. Contrary to the possibility that factions might be trying to leave the group, as option D implies, they are often very much a part of the group dynamics, influencing decision-making and legislation to further their own interests.