Final answer:
The best procedure for the auditor is to develop a program to compare credit limits with account balances and print out the details of any account with a balance exceeding its credit limit.
Step-by-step explanation:
The best procedure for the auditor to follow in order to determine whether credit limits are being exceeded in Smith Corporation's customer file is option B.
The auditor should develop a program to compare credit limits with account balances and print out the details of any account with a balance exceeding its credit limit.
This automated approach will efficiently identify accounts where the credit limit is exceeded and provide a detailed report for further analysis.