TOEFL Reading: ETS-TOEFL阅读机经 - SO4_VL156MQ64I5LL$

Which of the following can be inferred from paragraph 2 about the pastoral peoples in the East African Highlands around 3300 B.C. A. They lived around the mountains and rarely descended into the plains. B. They relied on different food sources during dry months than they did during wet months. C. Their settlements were larger than those of pastoral peoples in West Africa and the Sudan. D. They obtained food from nearby hunter-gatherer communities during wet months.