Infants' development of speech sounds is:
A) determined by the maturation rate of their limbic system.
B) based on their social interaction with caregivers.
C) determined in large part by such environmental factors as the child's family and socioeconomic conditions.
D) influenced by the growth of their muscles, sensory receptors in the vocal tract and changes in how their tongue fills their mouth.

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The Answer of Infants' development of speech sounds is:
A) determined by the maturation rate of their limbic system.
B) based on their social interaction with caregivers.
C) determined in large part by such environmental factors as the child's family and socioeconomic conditions.
D) influenced by the growth of their muscles, sensory receptors in the vocal tract and changes in how their tongue fills their mouth.

Infants' Development of Speech Sounds Is