IT IS MENTIONED IN THE LAST PARAGRAPH THAT DR. PETITTO PLANS TO ST...

58. It is mentioned in the last paragraph that Dr. Petitto plans to study ______. A. whether the sign system of the deaf is the physical equivalent of speech B. whether all children speak and make motions with their hand at the same time C. the assumption that the human brain prefers sign language to speech D. what happens when babies have the opportunity to learn both speech and sign language