William Believes That Developmental Change Is Primarily Caused by Maturational

William believes that developmental change is primarily caused by maturational processes. How might William explain why most infants say their first words by 18 months of age?

A) Most parents enroll their children into preschool by 18 months of age.
B) Talking is a natural ability that is triggered by 18 months of age.
C) Most humans learn to talk by 18 months of age due to the process of evolution.
D) Learning to talk by 18 months of age is an inborn genetic trait.

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