Because children often don't know how to use or care for materials, teachers should

• A. have alternate lesson plans ready.
• B. restrict the number of toys in a learning center so children won't destroy everything at once.
• C. supervise carefully, staying close enough to children that immediate consequences can be implemented if needed.
• D. be prepared to demonstrate use and care to children.

All of the options listed (A, B, C, and D) are appropriate strategies for teachers to implement when working with children who may not know how to use or care for materials. However, it is important to note that the best approach may vary depending on the specific context and needs of the children. Teachers should consider a combination of these strategies to ensure the best possible learning experience for the children.