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

If burndown charts are used to visualize progress, what does a trend line through a release burndown chart indicate?
A . The evolution of the cost spent on the project.
B . When all work will be completed to the Scrum Team can be released for other work.
C . When the work remaining will likely be completed if nothing changes on the Product Backlog or the Development Team.
D . When the project will be over if the Product Owner removes work that is equal in effort to any new work that is added.

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Answer: C