Of the Following Scenarios, Which Is the Best Example of Associative

Of the following scenarios, which is the best example of associative learning?

A) When Douglas asks a good question, the teacher smiles.
B) When class is dismissed, Lori walks home with her friend.
C) Jill prefers to work in small groups rather than independently.
D) Kevin needs a math tutor to help him catch up with the rest of the class.