If burndown charts are used to visualize progress, what does a trendline through a release burndown chart indicate?

[answerhappygod]

If burndown charts are used to visualize progress, what does a trendline through a release burndown chart indicate?

A. When all work will be completed so the Scrum Team can start work on a new Product Backlog.
B. When the project will be over if the Product Owner removes work that is equal in effort to any new work that is added.
C. When the work remaining is projected to be completed if nothing changes on the Product Backlog or Development Team.
D. The evolution of the return of investment on the project.