What is the name for a racing team in ancient Rome?

The term "Factio" is the correct answer because it specifically refers to the racing teams that participated in the chariot races of ancient Rome. These teams were typically associated with specific colors and had passionate supporters, often creating significant rivalries among them. Each factio operated under a name and ethos that identified them in the highly competitive race culture of the time.

The word "Faction" is a modern term derived from "factio" but is not the original Latin term. "Classis" refers to a group or class in a different context, particularly related to the military or social standings in Roman society. "Collegium" typically pertains to a group or guild, which can be related to various professional associations or religious orders, but it is not specific to the context of racing teams. Thus, "Factio" directly links to the organization and passionate identity of racing teams in ancient Rome's chariot racing scene.