What does the passage mainly discuss?
A、Why young people above 18 in the U.S. prefer toattend local colleges.
B、The reasons whymore and more young people in America move back to their parents’ homes rather than live on their own.
C、Young people in America should leave home when they reach 18.
D、How young people in the U.S. try to cope with the rising costs of housing. 无解析