In the poem, Tennyson refers to both Ulysses and Achilles. This technique is called B. allusion in literature. When you use allusion, you are referring to people or places outside of the novel or essay, or whatever it is you are writing. And since Ulysses and Achilles are not Tennyson's characters, he is alluding to them when he mentions them in his poem.
Since the 'inciting incident' is the one which starts all the problems in a literary work, the answer is B, 'establishment of the central conflict followed by the conflict increasing and a climax'.
