Answer:
Option D, In The Tragedy of Julius Caesar, the event that convinced Brutus that he was wrong to kill Caesar was the apparition of Caesar’s ghost
Step-by-step explanation:
After killing Caesar, Brutus realized that his act of killing Caesar was not correct when he saw Caesar's ghost. While addressing the public, Brutus in his omen confirmed his mistake and by that time he decided to die.
Hence, option D is correct