What Is Suggested by the Fact That Coos of All

Multiple Choice

What is suggested by the fact that coos of all infants sound the same, regardless of whether the infant can hear?

A) Such sounds arise from the infant's mutual exclusivity constraint.
B) Such sounds reflect the parents' recasts and extensions.
C) Such sounds convey self-generated meanings for adult listeners.
D) Such sounds develop with maturation of the brain and vocal organs.