Transparency is a core practice in Disciplined Agile to ensure that all stakeholders, including team members and customers, have a clear understanding of the project's progress and any challenges faced. The reasons for practicing transparency include ensuring everyone knows what is happening (A), improving team morale (B), and meeting customer expectations (D). Delaying bad news to customers contradicts the principle of transparency. Hence, "C. It delays breaking bad news to customers" is not a reason that Disciplined Agile teams practice transparency.