9. Sandra is a very busy mom with three children who are very successful in school. She tries to remember to praise them for their accomplishments, but she does not always remember. The children are experiencing what B. F. Skinner would call what?

The children are experiencing natural reinforcement.

Explanation:

Sandra's children are very successful in school and that is a stated natural reinforcer.

Natural reinforces occur as a result of their behavior without involving others expressing their approval of their behavior.

Sandra is trying to foster this natural reinforcement with positive social reinforcement, "but she does not always remember".