Final answer:
The call to adventure for Odysseus in The Odyssey is marked by the commencement of the Trojan War.
Step-by-step explanation:
Odysseus' Call to Adventure in The Odyssey
The significant event that marks Odysseus' call to adventure in The Odyssey is a) The Trojan War's commencement. This monumental conflict between the Greeks and the Trojans is the impetus for Odysseus' long journey, during which he encounters a plethora of challenges and adversities on his return home. According to LibreTexts, both the Iliad and the Odyssey are ancient epics that delineate the deeds and adventures of heroic figures like Odysseus during and after the Trojan War, providing a glimpse into ancient Greek values and the concept of arete, or excellence.