This passage contrasts a folk culture and a popular along all the following lines EXCEPT_______.

A．a popular culture is superior to a folk culture
B．a folk culture allows alterations
C．folk cultures will vanish soon under the influence of popular cultures
D．a folk culture is against using all kinds of modern facilities

A．compare the behavior of urban and suburban kids in terms of some social problems
B．highlight the gravity of some social problems involving kids
C．show the author's well-informedness
D．draw attention to the seriousness of problems with suburban kids