Final answer:
None of the listed literary devices are used in the specific situation of the Odyssey where there's no hint at a marriage between Odysseus and Nausikaa due to his existing marriage to Penelope.
Step-by-step explanation:
In the context of the question, the situation in which the possibility of marriage between Odysseus and Nausikaa is not hinted at due to Odysseus's existing marriage does not employ foreshadowing, irony, symbolism, or allusion as literary devices. The absence of a suggestion of marriage is simply a narrative detail that aligns with the established facts of the story—namely, Odysseus's loyalty to his wife, Penelope.
Therefore, none of the listed literary devices are at play in this specific situation.