TOEFL Reading: ETS-TOEFL阅读机经 - 1E595C44596195Q0L$

Why does the author mention "the famous waggle dance that bees perform" in the passage A. To give an example of a signal shared between worker bees B. To indicate how worker bees are able to find good food sites C. To show how environmental conditions affect bee behavior D. To illustrate how the presence of food stimulates bee activity