The underlined word "moping" in the last paragraph means

A．make the description more vivid only.
B．bring out the central idea.
C．serve as another example of successful dreams.
D．warn readers against fantastic thinking.

A．is against being a realist.
B．is no guard against unhealthy illusion.
C．believes that illusions are indispensable.
D．is afraid of getting depressed.