Final answer:
Situations where auditors allow their reports to be used again after the original issue date are referred to as subsequent use reports.
Step-by-step explanation:
When auditors provide additional copies of a previously issued report or grant entities permission to use a previously issued report in a document containing financial statements after its original date, these situations are known as subsequent use reports.
These situations can occur when auditors are asked to allow the inclusion of their reports in documents that will be circulated to shareholders or third parties, or when additional copies of the financial statements and auditor's report are required for newer stakeholders long after the original report was issued. The correct answer here is option c. subsequent use reports.