TOEFL Listening: ETS-TOEFL听力机经 - 8OJN1C_434_193GZP$

Why does the professor suggest that the student visit the greenhouse? A. The student might be able to conduct a research study there. B. A mushroom species that interests the student is being grown there. C. Mushrooms grow more quickly there than in other locations. D. Environmentally safe growing techniques are demonstrated there.