Answer:
C. Caesar’s decision to take Dictatorial powers for life.
Step-by-step explanation:
This is the event that was most likely responsible for causing the act wherein these words were uttered. When Caesar uttered these words, he was expressing surprise at the conspiracy that had planned his assassination. More especifically, he was expressing his surprise at finding out that Brutus was part of this conspiracy. Brutus, however, had joined out of concern for the republic. He knew that Caesar had taken dictatorial powers before, and he was worried that Caesar would become too powerful for the good of Rome.