"Here," Leon says as he hands a block to his friend Oliver. "That's a tiger."
Oliver takes the block-the "tiger."
"And this is a lion!" Leon adds as he picks up another block. "Let's see who is stronger, the tiger or the lion!"
In this scenario, Leon and Oliver are engaged in __________.
◦ centration
◦ conservation activities
◦ pretend play
◦ egocentrism