The nurse is caring for an infant. Which activity is $\mathbf{most}$ appropriate for the nurse to offer to the infant?

A) Set of cards to organize and separate into groups
B) Set of sock puppets with movable eyes
C) Set of plastic stacking rings
D) Set of paperback book

Adults and nurses facilitate infant learning by planning activities that promote the development of milestones and providing toys that are safe for the infant to explore with the mouth and manipulate with the hands such as rattles, wooden blocks, plastic stacking rings, squeezable stuffed animals, and busy boxes. Preschoolers demonstrate their ability to think more complexly by classifying objects according to size or color, making the cards more appropriate for them. Neither group is ready for paperback books. The sock puppet with movable eyes could create a choking hazard if one of the eyes comes off.