Almost Every Time Amos Articulates the Word "Da," His Father

Multiple Choice

Almost every time Amos articulates the word "da," his father picks him up with joy,smiles,and praises his son for trying to say "dad." The father's behavior reinforces Amos's behavior.Which theory of language acquisition is this an example of?

A) learning theory approach
B) universal grammar
C) nativist approach
D) infant-directed speech