Then there is a great difference between us and our opponents, in our attitude towards military security. Here are some examples: Our city is open to the world, and we have no periodical deportations in order to prevent people observing or finding out secrets which might be of military advantage to the enemy. This is because we rely, not on secret weapons, but on our own real courage and loyalty. –Pericles’s funeral oration, Thucydides

Which detail in the excerpt best supports the speaker’s purpose in giving the speech?
- Athens is open to the world.
- Athens does not deport outsiders.
- Athens does not safeguard its military secrets.
- Athens relies on courage and loyalty for its defense.