Since an antonym is an opposite, like a synonym is a similar word, the opposite of aggressive would be meek.
D. MADELINE: I think I'm an American. And for that reason I think I have something to say about America.
The correct answer is B.
This lines from the play "Julius Caesar" indicate that Brutus is afraid that, even though Caesar was not known for letting his emotions get the best of his reason, he will give in and will be changed by power.
Brutus believes that once Caesar the "top of the ladder" he will become too ambitious and forget about those who have helped him get where he is.
That is a full answer on your question hope it helps