TOEFL Reading: ETS-TOEFL阅读机经 - Y6DB6HKBOE1S65ABL$

According to paragraph 4, what advantages did the diet of hunter-gatherers probably have over an early agricultural diet? A. It required less effort for them to acquire food that was nutritious. B. It allowed their populations to expand across wider areas. C. It provided a greater variety of foods needed for them to stay healthy. D. It allowed them to have more children.