The Retrospective is an important agile ceremony because it provides a dedicated time for the team to reflect on their performance and processes, discuss what went well, what didn't, and how they can improve moving forward. This continuous improvement mindset is central to agile methodologies, including Disciplined Agile (DA). It helps build a culture of transparency, trust, and learning. Option B is incorrect because the Product Owner is not the focus of the Retrospective. Options C and D do not describe the purpose of a Retrospective in agile practices.