TOEFL Reading: ETS-TOEFL阅读机经 - 9K8VJYFW3F3PZ868L$

In paragraph 4, why does the author emphasize the point that "nine month olds are far from expert reachers" A. To support the idea that nine-month-olds vary a great deal in their reaching abilities B. To distinguish between the directed reaching and the non directed reaching of infants C. To stress that an infant's reaching skills continue to improve even after the first nine months D. To call into question the accuracy of the results presented by Clifton et al