The Fact That Children in Different Cultures ____ in the Age

Multiple Choice

The fact that children in different cultures ____ in the age at which basic motor skills appear demonstrates that ____.

A) vary somewhat; genetic factors can slow or accelerate early motor development
B) vary somewhat; environmental factors can slow or accelerate early motor development
C) do not vary; genetic factors alone determine early motor development
D) do not vary; environmental factors alone determine early motor development