Final answer:
The Scrum Master has the primary responsibility for ensuring that everyone understands and follows the Scrum rules and practices.
Step-by-step explanation:
The role with the primary responsibility for ensuring that everyone understands and follows the Scrum rules and practices is the Scrum Master. The Scrum Master is a facilitator and coach who guides the Scrum team and ensures that all team members understand their roles and responsibilities. They also help remove any obstacles or impediments that may hinder the team's progress.