A team has been working for two months and consistently misses the user stories they planned. How should the project manager address this problem?

The correct answer is ensuring the sprint size is appropriate for the iteration duration. Consistently missing user stories indicates that the team is overcommitting or the work planned for the sprint is too large for the given timebox. Adjusting the sprint size (the amount of work planned) to a more realistic capacity helps the team achieve their commitments and improves predictability. Recruiting a highly skilled resource might address skill gaps but doesn't directly solve an overcommitment issue if the team's overall capacity is still being exceeded. Changing the iteration duration to meet commitments is generally discouraged in agile, as consistent timeboxes help establish rhythm and predictability. A reward system might motivate, but it doesn't address the root cause of unrealistic planning or capacity issues.