Former social ceremonies that used to mark adolescence have given place to ______.

A．It takes children shorter time to mature,
B．Most children do not survive the harsh conditions.
C．Most teenagers become laborers rather than students.
D．There are no legal provisions in the primitive societies.

A．One is considered to have reached adulthood when he has a driver's license.
B．One is not free from the restrictions of child labor laws until he can join the army.
C．No one can marry without the permission of his parents until the age of twenty-one.
D．In the late 19th century in the United States the dividing line between adolescence and adulthood no longer existed.