a. Ethos because he’s uniting with his audience to surround Caesar’s body.
Explanation:
We can say that Antony made full use of ethos, which reinforces the sense of ethics in a speech. This is because in calling the people to gather around the body of Caesar, he joins the people and asks them to see for themselves, without intermediaries, the man they are causing death, but who made a beneficial will and advantageous.