Answer:
by shocking the reader with Olivia's refusal of Duke Orsino's affections
Step-by-step explanation:
The author introduces the theme of unrequited, or unanswered, love by shocking the reader with Olivia's refusal of Duke Orsino's affections.
Duke Orsinio displays his affection for Olivia but she rejects his advances and refuses his love which hurts the Duke. The author uses this scene to show the theme of unanswered love.