TOEFL Listening: TPO-TOEFL听力TPO - 9U237274L49MN89XR$

Why does the professor mention six-month-old infants? A. To emphasize that ANS is largely innate. B. To refute the claim that symbolic mathematics is learned. C. To point out the difficulty of testing mathematics ability in very young children. D. To contrast the way infants learn with how older children learn.