Same fire, new extinguisher

Scenario

A help desk keeps missing response targets. Management adds reminder emails, then stricter reminders, then daily warning messages. Performance improves briefly, then slips again.

Question

What most strongly suggests this is a system problem?

1. A.People do not care about the reminders
2. B.Repeated pressure changes behavior briefly but does not solve the recurring pattern
3. C.The team probably needs more slogans
4. D.The inbox software is definitely broken