Final answer:
C) Quarterly
Quarterly inventories of controlled substances must be completed every quarter by a disinterested officer to ensure proper management and prevent misuse.
Step-by-step explanation:
Quarterly inventories for controlled substances must be completed by the disinterested officer quarterly, as implied by the name. The requirement ensures that these sensitive items are properly accounted for and that any discrepancies are identified and addressed in a timely manner. Regular inventories are a critical component of controlled substance management protocols, which aim to prevent misuse and diversion.