Which Strategy Is LEAST Appropriate in Making a Center Self-Sustaining

Which strategy is LEAST appropriate in making a center self-sustaining?

A) Prepare the environment before children arrive and observe them in action, intervening for safety or socially inappropriate behavior.
B) Introduce the activity at group time, demonstrate use of the materials prior to children trying them in the center.
C) Use pictographs posted in the center to guide children's actions.
D) Use the center activity to give children a chance to practice something they have already been taught.