C. The mediator is the answer because even though the question is trying to gauge whether you know the meaning of the word mediator, it is also providing a grammatical solution to itself. None of the other words fit in that sentence correctly except for mediator, and also the word mediator (someone who is keeping peace between differing parties) fits the actions the sentence is proposing.
C. He binds himself to the mast
Explanation:
When Odysseus is passing near the Sirens he makes his men put beeswax into their ears so they cannot hear the Sirens.
<u>The Sirens are supposed to produce a lustful song that seduces men into their liar never to come back.</u>
He makes his men plug their ears but himself remains to hear the voices. To save himself from going for their call he asks his men to tie him to the mast so he cannot escape the ship.
If there were no rules then the world would be thrown into anarchy and crime would run rampant (think of the movie The Purge). There would be senseless killings and no one would be safe. <span />