In accordance with the CFR, clinical trial sponsors are required to retain records and reports...

TheFDA record retention requirementfor investigational drug studies is clearly outlined in21 CFR 312.57(c)and21 CFR 312.62(c).

21 CFR 312.57(c):“A sponsor shall retain the records and reports… for2 years after a marketing application is approvedfor the drug; or, if an application is not approved, until 2 years after shipment and delivery of the drug for investigational use is discontinued and FDA has been so notified.”

21 CFR 312.62(c):Investigators also must retain study-related records for2 years following the date a marketing application is approvedor 2 years after the investigation is discontinued.

This requirement ensures FDA can audit investigational product data even after approval to confirm compliance and verify trial results. Longer retention (e.g., 15 years) may be institutional or sponsor policy but is not mandated by federal law.

Thus, the correct answer isA (2 years).