Plan A is when you try to force an expectation on a child. Instead of working with a child to help them reach the expectations and prioritizing it would be saying you must perform this behavior and forcing an ultimatum on the child for example counting down. I know I have done plan A in my teaching quite a few times like "you either need to sit in your spot or go to the office" which I have noticed does increase behaviors. Plans A and C are battle-picking. Plan B is not about battling, it is about solving problems and teaching students skills to cope with the problems they have difficulty solving. I have used Plan B in the past when I have met a challenging student before class and helped them make a plan for what they are going to do during class and how we are going to work together to have them meet the expectations. Using Plan A on a challenging student will only cause the behaviors to persist.