对单一借款客户的授信集中度不得超过（）。

A. have not based their analyzes on a sufficiently large sample of actual managers.
B. have relied in drawing their Conclusions on what managers say rather than what managers do.
C. have misunderstood how managers use intuition in making business decisions.
D. have not acknowledged the role of intuition in managerial practice.

A. 2.25
B. 2.75
C. 3.5
D. 3.75

A. at
B. in
C. of
D. by