Final answer:
A proof of cash represents a test of details of balances, which is a reconciliation process to ensure the accuracy of a company's cash transactions as reported in financial records.
Step-by-step explanation:
A proof of cash is a reconciliation technique used by auditors to test the completeness and accuracy of a company's bank transactions. When a student asks what a proof of cash represents, the correct answer is: D) a test of details of balances. The purpose of a proof of cash is to reconcile the cash balances reported in the company's records with the cash transactions listed on the bank statements. This process helps ensure that all cash transactions have been accounted for and that the cash balance is accurate.