Ramona Has Recently Seen a Lot of Aggression in Her

Ramona has recently seen a lot of aggression in her preschool students. Which of the following actions is most likely to lower the aggression and promote cooperation in her room?

A) Select teams and start playing competitive sports.
B) Play games in which one student becomes the class champion.
C) Purchase open-ended materials, such as sand and water tables.
D) Assign individual play kits to each child.