Final answer:
An auditor would be considered independent if a professional employee, not involved in the audit, has a spouse working as a marketing manager for the client, as it does not impair the auditor's independence.
Step-by-step explanation:
According to the profession's ethical standards, an auditor would be considered independent in the instance where a professional employee, who does not work on the audit, has a spouse who is a marketing manager for an audit client. This scenario is not seen as impairing independence unless the spouse has a significant role with the client that could influence the financial statements. The other options provided: auditor also being an attorney who advises the client, employee donations as a treasurer of a client charity, and the client owing fees for past audits, would all threaten the auditor's independence due to potential conflicts of interest, self-review threat, and financial dependency respectively.