Answer:
All of the options are revealed by this scene except Wilde's use of irony to create satire.
Step-by-step explanation:
In Act II of The Importance of Being Ernest Cecily and Gwendolyn meet for the first time, and at first they were civil to each other. However when they found out that they are both engaged to (supposedly) the same man, that civility went out the window, replaced by rudeness veiled in politeness.
Wilde makes a satire of Victorian manners in the behaviors of Gwendolyn and Cecily during the tea ceremony, he similarly ridiculed the Victorian fashion by highlighting things as ridiculous as taking sugar as being unfashionable.
Ernest's true identity is revealed when the to men came back and the two women found that they are engaged to different men after all.
Wilde uses irony NOT in this scene but in the final act when Jack is reveled to be the nephew of Lady Bracknell and also Algernon's biological brother.