If you are considering lending to four prospects in the same industry and geographic region, which of the following would appear to be the riskiest?

A. A company that spreads its sales over a wide distribution of clients in a variety of industries

B. A company that makes no more than 5% of its sales to any one customer

C. A company that makes over 40% of its sales to one customer, with the rest of its sales widely diversified

D. A company with sales spread over a wide geographic area offering limited opportunity for word-of-mouth recommendations from satisfied customers