When the PIC directs that safety belts be fastened, an infant passenger for which no child restraint system is provided shall be
Why this is the answer
Per the CARs, when belts are ordered fastened and no child-restraint system is provided, the infant is held securely in the arms of a responsible adult whose own safety belt is fastened. Fastening one belt around both is unsafe and not permitted.
Reference
CARs 605.25 – Entering or Leaving an Aircraft in Flight CARs 605.26 – Parachute Descents
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.