Which action demonstrates a commitment to completing tasks?

Displaying a commitment to completing tasks is best represented by the action of focusing on finishing what needs to be done. This reflects a determination to see projects through to completion, which is a key aspect of reliability and accountability in a work environment. By prioritizing the completion of tasks, an individual shows dedication and responsibility towards their assigned duties. This trait is crucial in many work settings, as it not only aids in personal productivity but also contributes to the overall success of a team or organization.

The other options highlight different qualities such as optimism in discovering overlooked benefits, the belief in exceeding expectations, or a competitive nature. While these traits can also be valuable in the workplace, they do not specifically emphasize the commitment to following through and completing tasks as the first option does.