Which factor in the design of combustion chamber to avoid knocking and detonation in SI engine is not applicable

exhaust valves away from end gas

Which factor in the design of combustion chamber to avoid knocking and

1.	Which factor in the design of combustion chamber to avoid knocking and detonation in SI engine is not applicable
A.	long flame travel
B.	exhaust valves away from end gas
C.	cooling of exhaust valve
D.	small bore
Answer» B. exhaust valves away from end gas