In your answer, while you want to focus on how you helped the group achieve a result, try not to focus too much on your individual successes. You want to show that you're a team player, so avoid implying that the group only succeeded because of your efforts. Instead, focus on how you helped the group achieve something together. Telling a story from your past is the most effective way to communicate your strengths as a team member.

"I have years of experience working on team projects at my previous marketing job. I was involved in situations where out-of-the-box thinking was necessary to deliver the project. I excel at communicating with my peers and find it most beneficial to establish open lines of communication. On a past project, I recommended we utilize Slack to connect as a team and keep in constant communication. Improvement can only be made with successful teamwork, and I feel this is important in any marketing role."