Every Time 2-Month-Old Alberto's Mother Gives Him a Bottle, She

Every time 2-month-old Alberto's mother gives him a bottle, she smiles and sings him a song. If classical conditioning is correct, Alberto should soon start sucking

A) whenever his mother says his name.
B) only when the bottle's nipple is placed in his mouth.
C) when his mother smiles at him.
D) when his mother smiles and places the bottle's nipple into his mouth