We can complete the sentence as "Circe warned Odysseus about the sirens, who sat on the rocks and lured sailors to their deaths," stated in option A.
Who were the sirens?
In the epic poem "The Odyssey," the sirens were mythological creatures much like the mermaids we often see in movies. They would sit on the rocks and sing, luring sailors to their deaths.
Circe warns Odysseus about them, so Odysseus is prepared. He has his sailors cover their ears but, since he wants to listen to the sirens' song, he does not cover his. Instead, he asks his sailors to tie him to a mast so that he can hear the sirens safely.
With the information above in mind, we can select option A as the correct answer for this question.
Learn more about the sirens here:
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