Which of the following is the most important question the internal auditor should ask to develop an appropriate recommendation for this finding?

During an account receivables audit, an internal auditor found a significant number of input errors resulting in a $500, 000 balance understatement.

Which of the following is the most important question the internal auditor should ask to develop an appropriate recommendation for this finding?
A . Who?
B . How?
C . Why?
D . When?

Answer: C