Technically, NTSB investigations are never ______.

• A. Open
• B. Publicly Accessible
• C. Classified
• D. Closed

Answer: (D)

The point being tested is that NTSB investigations are meant to stay active in the pursuit of safety and remain accessible for review and updates. The NTSB keeps investigation dockets open to the public and can reopen or revise findings if new information comes to light, which means the process isn’t intended to end permanently. In practice, this transparency and potential for ongoing safety revision is why the statement uses the idea that investigations are never closed. The other options don’t fit because open/public access is the norm, and classifications aren’t how these investigations are handled; the emphasis is on ongoing safety oversight rather than permanent closure.