Of the five bill collectors at Apex Collection Agency, Mr . Mamun has the highest rate of unsuccessful collections . Yet Mr . Mamun is the best bill collector on the agency's staff. which one of the following , if true, most helps to resolve the apparent

None of the bill collectors at the agency has been working longer than Mr . Mamun

The other four bill collectors at the agency consider Mr. Mamun to be a very capable bill collector

Mr. Manun's rate of collections per year has remained fairly steady in the last few years.

Before joining the agency , Mr. Mamun was affiliated with the credit department of a large department store

Mr. Mamun is assigned to the majority of the most difficult cases at the agency