The most common party system is:
D.faction
Step-by-step explanation:
Factions are societal barriers that divide residents based on their beliefs and purposes.The factions are Dauntless (the fearless), Amity (the class), Erudite (the original), Abnegation (the selfless), and Candor (the fair). On an appointed day of every year, all sixteen-year-old young adults must select the faction to which they will devote for the remainder of their lives after taking a situation test.