A. None of the bill collectors at the agency has been working longer than Mr . Mamun
B. The other four bill collectors at the agency consider Mr. Mamun to be a very capable bill collector
C. Mr. Manun's rate of collections per year has remained fairly steady in the last few years.
D. Before joining the agency , Mr. Mamun was affiliated with the credit department of a large department store
E. Mr. Mamun is assigned to the majority of the most difficult cases at the agency
