Which outcome is expected as Scrum Teams mature?

Which outcome is expected as Scrum Teams mature?
A . They will improve their definition of “Done” to include more stringent criteria.
B . The Sprint Retrospectives will grow to be longer than 4 hours.
C . There is no need for a time-boxed Sprint, since time-boxes are only for new Scrum Teams.
D . Sprint Reviews will no longer be needed.
E . A Scrum Master is no longer needed since they are a mature team now.

Answer: A