The part of the role the Scrum Guide describes least. What self management actually requires, how a Scrum Master facilitates each event without owning it, the difference between coaching and telling, what to do when a team is in conflict, and how the accountability reaches the organisation around the team.
The Developers of a payments API team have started asking the Scrum Master each morning at the Daily Scrum which item each of them should pick up next, and they say the day runs more smoothly when somebody decides. What should the Scrum Master do?
ADecline, and coach the Developers to make the allocation between themselves.
BMake the allocation each morning, since the Developers have asked for the help.
CAsk the Product Owner to allocate the items against the order of the backlog.
DRecord the allocation in the Sprint Backlog so the arrangement stays visible.