TOEFL Listening: TPO-TOEFL阅读TPO - 64U039ESMF55D9K9N$

In paragraph 4, what does the author suggest about the way an infant's brain perceives stimuli? A. An infant's potential to respond to a stimulus may be related to the size of its brain. B. Changes in the electrical patterns of an infant's brain are difficult to detect. C. Different areas of an infant's brain respond to different types of stimuli. D. An infant is unable to perceive more than one stimulus at a time.