TOEFL Listening: ETS-TOEFL听力机经 - 4FHA4U254QU3ZJE7P$

Why does the professor mention cake? A. To illustrate the importance of finding a representative sample B. To illustrate why the man will need only a small sample C. To explain why some areas of town are more crowded than others D. To explain the disadvantage of relying only on questionnaires