Which option best illustrates supervised selection of toys and materials?

The selection of toys and materials in early childhood settings must prioritize safety, engagement, and developmental appropriateness. The option about ensuring enough staff to watch children properly when they use the item best illustrates the concept of supervised selection. This emphasizes the importance of adult supervision in monitoring children's interactions with toys and materials, ensuring a safe environment where children can explore and learn. Proper supervision is crucial because it helps prevent accidents, supports positive interactions, and allows caregivers to guide children’s learning experiences, making sure that interactions with toys and materials are enriching and developmentally beneficial.

The other choices, while relevant to aspects of sourcing and managing materials, do not specifically highlight the significance of supervision in selecting and using toys. Many toys can be open-ended, and although having adequate storage space or a plan for incremental purchases is important for overall classroom management, these factors do not directly address the core aspect of supervision that ensures children's safety and optimal engagement with their learning environment.