Answer:
A. Use concrete reinforcers even when children are intrinsically motivated to learn.
Step-by-step explanation:
Concrete reinforcement is carried out by giving either reward or discouragement to motivate the children into doing a behavior that we want them to.
When children are already intrinsically motivation to learn, this type of reinforcement is no longer necessary and doing that possess the risk to actually stray the children's motivation away from learning by themselves.