Explanation
According to the PI Objectives article on the Scaled Agile Framework website, uncommitted objectives are used to identify work that can be variable within the scope of a PI. The article states that "Uncommitted objectives help improve the predictability of delivering business value since they are not included in the team's commitment or counted against teams in the ART predictability measure. Uncommitted objectives are used to identify work that can be variable within the scope of a PI. The work is planned, but the outcome is simply not certain. Teams can apply uncommitted objectives whenever there is low confidence in meeting the objective, but include in their plan." Therefore, the correct answer is B, teams have low confidence they can meet the objective, but include in their plan. The other options are not accurate, as they do not reflect the definition of uncommitted objectives.