Final answer:
The term 'ranks graduate from the Institute' doesn't directly correlate to Roman historical ranks. Instead, in ancient Rome, ranks in the military and political arena were gained through progression in service and included positions like centurions and consuls. The question may be alluding to a progression through such ranks, although it's not specific to an institutional graduation.
Step-by-step explanation:
The ranks that would graduate from the Institute are a topic related to historical military and social structures, rather than a specific terminology from within a particular Institute. In the Roman context, there were various ranks and positions within the military, political hierarchy, and religious spheres. For example, in various religious cults such as Mithraism, ranks within the congregations were correlated to the seven planets, indicating a hierarchical structure based on a combination of social and religious status. In a broader Roman military context, leaders like legionary legates, who were appointed by the government or the emperor, could work their way up through exemplary service. Those senior in rank would often hold multiple titles, like Princeps Senatus or commander of entire Roman armies.
However, in the specific context of the Roman military and political structures, the question about the three ranks that graduate from the Institute seems to relate to the hierarchical grades within ancient Roman society. The options provided do not explicitly align with accurate historical titles or ranks within the Roman context. The most fitting answer must be informed by historical context, although the exact phrasing 'graduate from the Institute' does not directly correspond to known Roman ranks. Therefore, we might infer and focus on those ranks within the broader Roman hierarchy that align with progression through service and honor, such as centurion for military service, and higher political titles such as consul for political leadership, reflecting advancement through the societal structure.