The primary objective of an aviation safety investigation into an aircraft accident or aircraft incident is to
Why this is the answer
Under the TSB's mandate the sole objective of an aviation safety investigation is to advance safety by finding causes and preventing recurrences — explicitly not to assign blame or liability or to enforce regulations (TC AIM-GEN).
Reference
TC AIM-GEN – Aviation Safety Investigation
Question reproduced verbatim from Transport Canada’s PSTAR Study and Reference Guide (TP 11919E). The answer key is Transport Canada’s; the explanation is ours.
A study aid — not a substitute for the official guide, the CARs, or your instructor.