A Scrum Master is keeping a list of open impediments, but it is growing and...

The correct answers are A, B, and D, because these techniques would be most helpful in this situation. Consulting with the Development Team may help identify the root causes of the impediments and possible solutions. Prioritizing the list and working on them in order may help reduce the backlog and focus on the most important or urgent issues. Alerting management to the impediments and their impact may help escalate the problems and get support from the organization.