What is the purpose of a hook in essay writing?

Which detail from chancer's "the monk's tale" best demonstrates that fortune is a "blind property" that no one should trust? a.julius ceaser rose up because of wisdom, bravery, and intelligence b. king belshazzar became the ruler after his powerful father became king c.samsons enemies blinded him but he was able to destroy them before he died d.queen zenobia enjoyed vast power but her enemies conquered her in the end