Answer:
Your answer is C.
Step-by-step explanation:
Military tribunes were originally infantry commanders. Under the early republic there were six to a legion; some were appointed by the consuls (chief executives) or military commanders, and others were elected by the people. Under the empire he military tribune was a preliminary part of a senatorial or an equestrian career and subject to the emperor’s nomination. Tribunes commanded bodyguard units and auxiliary cohorts.
I hope this helps :)