Answer:
Brutus decides to join the conspiracy against Caesar because he fears that Caesar will become ruthless once he has absolute power.
Step-by-step explanation:
This is the best way to describe how the characterization of Caesar in the passage connects to the central idea. In this passage, Brutus reflects on the qualities of Caesar. He tells us that so far, he does not think he has any reason to doubt Caesar's integrity. However, he is unsure about the ways in which this character might change if Caesar is given more power. Despite his qualities, men who have a lot of power often abuse it. Therefore, Brutus concludes that he will join the conspiracy against Caesar because he fears that Caesar will become ruthless once he has absolute power.