An aircraft is “cleared to the circuit” where a left hand circuit is in effect. Without further approval from ATC a right turn may be made to
Why this is the answer
Cleared 'to the circuit' for a left-hand circuit, a right turn is permitted only to join crosswind or as a partial right turn onto downwind (TC AIM-RAC, Initial Clearance) — not to cut directly to base or final.
Reference
TC AIM-RAC – Initial Clearance
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.