At the eighth Sprint Review, the stakeholders are upset that the product being built is not what they expected and will

[answerhappygod]

At the eighth Sprint Review, the stakeholders are upset that the product being built is not what they expected and will incur additional costs that was not planned for.
What may have led to this?

A. The Scrum Master has not been reporting on the progress of the Scrum Team. The Product Owner has not been managing the Development Team's tasks effectively. The Development Team has not been improving their velocity.
B. The Scrum Master has not ensured that the project is transparent. The Product Owner has not made the stakeholders aware of the progress of the project. The stakeholders have not been attending the Sprint Reviews.
C. The Scrum Master has not been attending the Daily Standup. The Product Owner has not been using the Gantt chart correctly. The Stakeholders has not been invited to the Sprint Retrospectives.