The main idea of the article is about_____.

A．Because the Native American needed their own activity center.
B．Because of the police's bad and rude behaviour towards the Native American.
C．Because the Native American was segregated.
D．Because the American government realized the Native American's terrible living conditions.

A．To demonstrate their power and show their determination to fight against the government.
B．To draw public attention to the poor conditions of Native American reservations throughout the United States. and to protest the U.S. government's treatment of Native Americans and the loss of their ancestral lands.
C．To appeal to the people to invest more money on the Native American.
D．To protest the Vietnam War.