Four-year-old Walter can be expected to have reached all but one of the following social-emotional developmental milestones. Which is he not likely to have reached?

1) Ask for something he wants from another child rather than just grab it.
2) Desire and be able to spend long amounts of time in large groups.
3) Engage in cooperative activities and projects with other children.
4) Understand when he has done something wrong and sometimes independently offer an apology.