TOEFL Reading: ETS-TOEFL阅读机经 - BJ4J0T7PLPRF3101L$

According to paragraphs 3 and 4, what is one way in which fire helps maintain the character of grasslands? A. It prevents trees from becoming permanently established. B. It helps new plants grow. C. It causes charcoal to deposit in layers on grassland soils. D. It kicks out the wild grazing animals that can quickly consume too many of the grassland plants.