According to Paragraph 4, longer school days______.A．force rich families to provide additi

According to Paragraph 4, longer school days______.

A．force rich families to provide additional tutoring for their children

B．help narrow income gaps between rich and poor in the United States

C．increase the opportunities of employment for the underprivileged

D．benefit poor families by providing the children with additional classes

请帮忙给出正确答案和分析，谢谢！