The lady in this strange tale very obviously suffers from a serious mental illness. Her plot against a completely innocent old man is a clear sign of （）

A．Similarities in the interpersonal relationships between urbanites and small-town dwellers.
B．Advantages of living in big cities as compared with living 'in small towns.
C．The positive role that urbanism plays in modern life.
D．The strong feeling of alienation of city inhabitants.

A．the better its quality of life
B．the more similar its interests
C．the more tolerant and open-minded it is
D．the likelier it is to display psychological symptoms of stress