Final answer:
The correct document an auditor asks a client to send to its legal counsel for information about asserted claims is a letter of audit inquiry. It's used during audits to communicate with legal counsel regarding litigation that may affect financial statements.
Step-by-step explanation:
When an auditor asks a client to send a letter to its legal counsel requesting information about asserted claims, the correct document to use is a letter of audit inquiry. This is a standard procedure during an audit for obtaining information regarding litigation, claims, and assessments involving the client. The letter of audit inquiry serves as a communication tool between the auditor and the legal counsel to identify any legal matters that may have a financial impact on the organization's financial statements.