Final answer:
The fire at the beginning of Aeschylus' 'Agamemnon' does not signify betrayal; it is a symbol of victory, and can also represent sacrifice and revenge in different contexts.
Step-by-step explanation:
The fire seen at the start of Aeschylus' Agamemnon signifies multiple things, however, among the options given, betrayal is NOT what the fire is signifying. The fire predominantly represents victory, as it is a beacon signaling the fall of Troy and the triumphant return of Agamemnon. In various narratives, including those surrounding the Trojan War and Greek tragedies, fire may also be symbolic of sacrifice and revenge, as it can be seen in rituals or as an agent of destruction in the context of vengeance.