The correct answer is A. Add the field to the custom report type field layout.

The report already exists: Position with or without Applicants Report. The issue is not that reporting is disabled for the object; the issue is that the new Applicant field is not available as a column in that custom report type. For custom report types, fields available to report builders are controlled by the custom report type field layout. Salesforce’s documentation for adding fields to a custom report type directs admins to open the report type and use Edit Layout to add the missing fields.

B is incorrect because field-level security can hide a field from a user, but the troubleshooting step for a field missing from a custom report type column list is to add it to the custom report type layout.

C is incorrect because the report type already exists and is being used.

D is incorrect because the field data type was already assigned when the field was created.

===========