Which of the following contributes to an increased sense of ownership in group outcomes?

A sense of belonging significantly contributes to an increased sense of ownership in group outcomes. When individuals feel they are part of a group, they are more likely to invest time and effort into the group's success because they identify with the group and its goals. This emotional connection creates a bond, fostering collaboration and encouraging members to take responsibility for their contributions to the group's outcomes.

In contrast, attributes like self-confidence might enhance an individual's ability to participate actively, but they do not inherently cultivate a sense of ownership regarding collective results as deeply as belonging does. Media influence can shape perceptions and behaviors, but it does not create personal ties to the group. Gender expectations may affect roles and participation in groups, but they do not necessarily lead to a stronger sense of collective ownership. Thus, the sense of belonging stands out as the element that most directly fosters a commitment to and ownership of group outcomes.