You're sitting with a parent while her child plays quietly in the corner. The parent remarks that this is

the first time the child has sat and paid attention to the same toy for so long without getting into trouble or
breaking anything. You take the opportunity to discuss theories of positive reinforcement so that the parent
will offer praise and attention for good behavior. This is an example of what concept?
A. Positive interactionism
End of exam
B. A teachable moment
C. An exercise in restraint
D. Professional insight

my answer is a.

I agree.