In the play's final act, why does Antony describe Brutus as the noblest Roman of them all?

A. Antony is acknowledging that Brutus came from a very wealthy and aristocratic Roman family.
B. Antony considers Brutus to be a traitor and a criminal; his words are sarcastic.
C. Antony knows that Brutus was the only conspirator who acted for the good of Rome.
D. Antony was once Brutus s best friend.