What conflict does Brutus describe in this passage? his external conflict with Cassius
his external conflict with Mark Antony
his internal conflict over killing Caesar
his internal conflict about the state of Rome

A. his external conflict with Cassius.

Explanation:

nobody knows everything, but parents are normally more experienced than their children based off of worldly experience despite the fact that a child might think that they know better than their parent in any given situation this might just be caused by ignorance and lack of experience.