Final answer:
A 4th grader like Eric who spends considerable time with peers is more inclined towards engaging in team sports, which facilitates social skills like cooperation and sharing.
Step-by-step explanation:
Considering Eric is a 4th grader who spends a lot of time with his peers, he is more likely to engage in team sports. During this middle childhood stage, children transition from playing with same-gender friends to mixed-gender groups, and peer interaction becomes quite significant. As they engage in group activities, they learn vital social skills such as cooperation, sharing, and possibly dealing with feelings of jealousy. Activities like team sports would support these social developments and align with the peer-group activities that many children enjoy during this age.