‘Night’ in Canada is that period of time between
Why this is the answer
Per CAR 101.01, 'night' is the period between the end of evening civil twilight and the beginning of morning civil twilight — the dark complement of the regulatory 'day.' Sunset-to-sunrise understates it, since civil twilight still counts as day.
Reference
CARs 101.01 – Night TC AIM-GEN – Glossary of Aeronautical Terms
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.