Final answer:
The correct action is to advise management to disclose the subsequent event—the customer's fire— and its potential impact on future financial performance and the collectability of A/R in the financial statements' footnotes.
Step-by-step explanation:
The student's question pertains to the treatment of a subsequent event in auditing, specifically one that occurred after the balance sheet date but before the audit report date. According to auditing standards, auditors have a responsibility to evaluate subsequent events that could have a material effect on the financial statements. In this case, where the client's largest customer suffered a significant loss due to a fire and the customer accounts for a significant portion of the client's sales, this event could affect the client's future financial performance and the collectability of the customer's accounts receivable (A/R).
The correct course of action is to advise management to disclose the fire and its potential impact on future financial performance and the collectability of the customer's A/R in the financial statements (F/S) footnotes (option d). This disclosure would inform users of the financial statements about the event and its potential effects. It is not appropriate to write off all A/R as uncollectible at the balance sheet date, disclaim an opinion, or ignore the event. The necessary disclosure in the footnotes would ensure that the financial statements present a true and fair view of the company's financial position and performance after considering the subsequent event.