In Act I, Olivia develops romantic feelings for Cesario (Viola).
How does this develop the plot of Twelfth Night?
O Olivia finds out that Cesario is really Viola and finally consents to marry the Duke.
O It causes Olivia to want to marry Cesario, but she does not know that it is Viola disguised as a man.
O It causes Olivia to feel embarrassed and angry when she finds out that Cesario is really Viola.
O Cesario convinces Olivia that the Duke is wonderful, and Olivia's feelings for the Duke grow stronger.