Explanation:

- Imitation (Option 1): This is the first stage where children mimic the actions and words of the people around them without understanding their meaning.

- Play (Option 2): In this stage, children start role-playing and acting out roles like "doctor" or "teacher", understanding the perspective of just one role at a time.

- Games (Option 3): Here, children play organized games, following rules and understanding multiple roles within a group, grasping the concept of the "generalized other."

- All of the above (Option 4): Each stage is distinct in Mead's theory, with role-playing specifically linked to the play stage.