Which report option most likely requires access to the appraiser's workfile for the review appraiser?

The correct choice highlights that a Restricted Appraisal Report is the option most likely requiring access to the appraiser's workfile for the review appraiser. A Restricted Appraisal Report is typically limited in its audience; it is prepared for a specific client and contains fewer details than other report types. This restriction often necessitates that the review appraiser examines the underlying workfile, as the report may not provide all the information or analysis used in the appraisal conclusion.

In a Restricted Appraisal Report, key details that a reviewer might seek to validate or understand the methodology could be found only in the appraiser's workfile, which includes data, analysis, and thought processes that led to the conclusions stated in the report itself. Due to its limited scope, this type of report does not disclose all necessary information within the report itself, thus requiring a deeper review of the workfile.

In contrast, Appraisal Reports and Narrative Reports generally include more comprehensive information and analysis within the report itself, allowing a review appraiser to assess the appraisal without needing to delve into the workfile to the same extent. These report formats are designed to provide sufficient detail to support their conclusions and are intended for broader audiences who require clarity and context.