A. Yes, this is cause for concern - the Scrum Master for this team is not making this team as productive as the others.

B. No, this is not cause for concern - velocity is not a meaningful measurement of the value delivered by agile teams.

C. Yes, this is cause for concern - the Product Owner for the team in question is not pushing the team hard enough.

D. Yes, this is cause for concern - the team in question has not calibrated their story points with the rest of the teams.

E. Yes, this is cause for concern - the team in question is performing worse than the rest.

F. No, this is not cause for concern - the team in question will probably increase their velocity over time.