As it is mentioned in the passage, schools in the United States do the following exceptA．p

As it is mentioned in the passage, schools in the United States do the following except

A．providing important outside-academic activities.

B．serving social units such as family and community.

C．arranging six-hour teaching and learning every day.

D．having competition with schools of other countries.

请帮忙给出正确答案和分析，谢谢！