At the fifth Sprint Retrospective, the Product Owner mentions that he is surprised about the amount of technical debt th

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At the fifth Sprint Retrospective, the Product Owner mentions that he is surprised about the amount of technical debt that has built up in the system and that the product is not able to support an adequate number of users. Peter, the Product Owner, is upset that the product will need several more Sprints to address the scalability issues in order to meet his expectations.
What factors may have led to this?

A. The Scrum Team has not used the past Sprint Retrospectives effectively to inspect and adapt.
B. The Development Team has not been paying enough attention to technical quality.
C. The Development Team and the Product Owner are not having conversations around technical debt.
D. The Scrum Master has not ensured that the Scrum Team is transparent.
E. All of the above.
F. None of the above.