According to the Scrum Guide, the Sprint Review is a time for the Scrum Team and the stakeholders to inspect the product Increment and adapt the Product Backlog if needed. The Product Owner is responsible for keeping the stakeholders aware of the progress of the project and inviting them to the Sprint Review. If the Product Owner has not been doing this, or if the stakeholders have not been using the Sprint Review to inspect and evaluate progress, then they may be disappointed and angry at the seventh Sprint Review. The other options are not likely factors that led to this situation, as they are either irrelevant (such as the PMO or the development area) or incorrect (such as delaying the release).

According to the Scrum Guide1, the Scrum Master is accountable for establishing Scrum as defined in the Scrum Guide. They do this by helping everyone understand Scrum theory and practice, both within the Scrum Team and the organization.

The correct answer is B, because when multiple Scrum Teams work from the same Product Backlog, they should pull in work in agreement with the Product Owner. The Scrum Guide states that "multiple Scrum Teams often work together on the same product. One product goal unites them. Therefore, they must mutually define and comply with a definition of 'Done' that applies to their combined work product." Therefore, they should collaborate and coordinate with each other and with the Product Owner to select Product Backlog items that align with their shared product goal.

Architecture and infrastructure are handled in Scrum by implementing them along with functional development of the product, and by adding them to the Product Backlog and addressing them in early Sprints, while always requiring at least some business functionality, no matter how small, as stated in [2]: "Scrum does not distinguish between developing functionality or architecture. They are developed together, as they are both important and support each other. Architecture is not a separate phase; it is part of the product development. Architecture is added to the Product Backlog as any other feature or functionality."

The correct answers are B and D, because the Scrum Guide states that "the number of items selected from the Product Backlog for the Sprint is solely up to the Development Team. Only the Development Team can assess what it can accomplish over the upcoming Sprint." Therefore, the Development Team can remove or change selected Product Backlog items in agreement with the Product Owner if they see that the workload is greater than they can handle. The Development Team should also ensure that the Product Owner is aware of the situation, start the Sprint, and monitor progress.