The correct answers are B and E, because Scrum has no "tester" role and everyone in the Development Team is responsible for quality. The Scrum Guide states that "the Development Team consists of professionals who do the work of delivering a potentially releasable Increment of 'Done' product at the end of each Sprint. Development Teams are structured and empowered by the organization to organize and manage their own work. The resulting synergy optimizes the Development Team's overall efficiency and effectiveness."

Explanation/Reference:

The Sprint Retrospective is an opportunity for the Scrum Team to inspect itself and create a plan for improvements to be enacted during the next Sprint. The topics that are appropriate for discussion are those that relate to how the team does its work, such as processes, tools, communication, collaboration, quality, etc. The value of work currently represented in the Product Backlog and arranging the Sprint Backlog for the next Sprint are not appropriate topics for discussion in a Sprint Retrospective, as they belong to the Sprint Review and Sprint Planning events respectively.