The question talks about how Oscar Wilde's humor is about people not being what they're like.
When you use that as a basis to define what references that sense of humor, it becomes simple to identify.
It can't be A, because there's nothing deceiving in the sentence. Same goes for the second one, although it is funny, nothing conflicts with the clear image presented in the option. The Option C is also clear and direct.
Option D, though, is quite different.
D.)“Well, my name is Ernest in town and Jack in the country . . .”
Here he plays with the idea that he is two different people. So he is not who he appears to be, at least for someone.
Letter D is the correct answer