Final answer:
A Scrum burn-down chart should contain the remaining work over time for a sprint. It shows the initial estimated work and tracks its completion on a daily basis towards the end of the sprint, providing clear visualization of the team's progress.
Step-by-step explanation:
A Scrum burn-down chart should consist of B) Remaining work over time. The burn-down chart is a graphical representation that shows the amount of work that still needs to be completed in the sprint versus the time. It is updated daily and provides a simple visual to track the sprint progress towards the goal. The chart typically starts with the total amount of work or effort estimated for the sprint and it 'burns down' to zero by the end of the sprint.
It does not show the progress of individual team members, which relates to individual performance rather than team progress. Also, it does not directly show completed user stories, although those would contribute to the remaining work decreasing. Finally, sprint retrospective notes are not part of the burn-down chart but are discussed separately after a sprint is completed to improve future sprints.