The correct answer is D. She has everything in the world, but she is unhappy.
Daisy, from Fitzgerald's "The Great Gatsby," is a young, married woman, who seemingly has it all. She is rich, beautiful, has a lovely daughter, but is somehow unhappy. She fell in love with Gatsby when they were younger, but he disappeared and she had to marry someone else, which is one of the reasons she is sad.
Paradox is a figure of speech where you expect one thing to happen, but the reality is that the opposite will happen. We expect Daisy to be happy with all the things she has, but she is in fact not.