During an audit of the accounts payable process, an internal auditor was assigned to confirm...

Tracing starts with source documents (e.g., receiving reports) and follows them forward through invoices and accounting entries to ensure completeness.

Vouching starts with recorded entries and looks backward to supporting documents, testing validity.

Independent confirmation involves external verification (e.g., with vendors).

Reperformance involves redoing a control activity.

Here, the test begins with receiving documents and traces forward to invoices and postings, making tracing the correct procedure (Option B).