The Fact That Children in All Cultures Are Able to Master

The fact that children in all cultures are able to master the rules of language relatively early in life without formal instruction was discussed as evidence indicating that:

A) language acquisition may have a biological basis.
B) parents cross-culturally invest a lot of effort in teaching their infants language.
C) the learning of language is largely shaped by the environment.
D) children use deductive reasoning to learn language.