In paragraph 2, "the most important four" refers to ______.

A．Modern African politicians approve of tribal divisions.
B．A person is usually taken care of by his own tribe.
C．Africans consider it an obligation to give a job to a fellow tribesman.
D．Tribalism is still a powerful force in day-to-day African life.

A．Sharing among members of the extended family.
B．Giving a job to a fellow tribesman.
C．A force that can be both good and bad.
D．People have the same religious belief.