"who is primarily responsible for ensuring that everyone follows scrum rules and practices"

The person who is responsible for ensuring that the team members follow the scrum rules and practices is the Scrum Master of the Team. A Scrum Master is defined as the facilitator of a perceptive development group. He or she is the one responsible to manage the processes on how information will be exchanged.

The correct answer is "the protesters were attacked by chinese troops and many were killed or arrested."