The best statement that explains what Daisy means by referring to herself as sophisticated is:
C. She has a pessimistic view of the world she lives in.
In the excerpt, Daisy expresses a sense of cynicism and disillusionment about life, declaring that she thinks "everything's terrible anyhow." Her reference to being sophisticated seems to be tied to her experiences and the stark realization of the world's shortcomings, rather than a true sense of enlightenment or contentment.