Answer:
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".
Call your bank and tell them, then you'll get a new one. Your old one that got stolen will be cancelled so it can't be used anymore
North Vietnam went to war with the republic of Vietnam via it’s proxy the Viet Cong, in the attempt to get south Vietnam under the control communist party.
I hope that helps.
I’m guessing B, but I’m not for sure