TOEFL Reading: ETS-TOEFL阅读机经 - 3QH38TEQS3V6383FL$

According to paragraph 3. why are willows a species that are now found in different countries worldwide? A. They adapt easily to a variety of environments. B. They have characteristics that make them useful in preserving river banks during floods. C. They have a root system that allows them to reproduce easily and live long. D. They require little care or management from humans.