If a flight plan is not filed, a flight itinerary must be filed
Why this is the answer
Per CAR 602.73, a VFR flight plan or itinerary must be filed unless the flight stays within 25 NM of the departure aerodrome — so any flight going 25 NM or more from the point of origin requires one. The trigger is distance from departure, not destination or terrain.
Reference
CARs 602.73 – Requirement to File a Flight Plan or a Flight Itinerary TC AIM-RAC – Flight Plans and Flight Itineraries, When Required
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.