A new field has been added to the Applicant object that is part of an...

When a field is added to an object, it doesn’t automatically appear in custom report types — even if the field is visible and reportable. The app builder must manually add the field to the custom report type layout to make it available in reports.

Why D (Add the field to the custom report type field layout) is correct:Exact Extract:“If a new custom field isn’t available in your report builder, edit the custom report type layout and add the field. Fields created after the report type was built must be added manually.” — Salesforce Help | Custom Report Types

Why not A:Field-level security controls visibility but not inclusion in the report type layout.

Why not B:“Allow Reports” affects whether the entire object is reportable, not individual fields.

Why not C:The “Manage Public Reports” permission allows editing public reports but doesn’t influence field visibility.