Answer:
The event that marks the climax of Oedipus the King is Oedipus’s realization that he is both his father’s murderer and his mother’s husband.
Step-by-step explanation:
When Oedipus comes to realize that he is the guilty one of the plague that has struck the city of Thebes and he is the one that caused the pain of so many people by fulfilling the prophecy that was so long said about the man who was going to kill the king and sleep with his own mother, it shocks the character to know the truth and it brings the climax of the story.