TOEFL Listening: ETS-TOEFL听力机经 - X0493E4U633U48CYP$

Why does the professor mention the yucca moth's mouthparts? A. To indicate that they are potentially harmful to the yucca plant B. To point out that the mouthparts are similar to those of bees C. To explain why only yucca moths can pollinate the yucca plant D. To explain the difference between the mouthparts of male and female yucca moths