Correct answer
The engine’s cooling passages and radiator.
Between the engine’s cooling passages and radiator, where heat is transferred to air. The pump moves coolant around the circuit; with the thermostat closed, coolant may use a bypass depending on design. An expansion tank can be part of the system but does not replace the main engine-radiator route. In a wet-sump system, the sump holds lubricating oil and is not the main coolant route.
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The radiator and oil sump as the sole main route.
Only the radiator and expansion tank, without passing through the engine.
The engine’s cooling passages and radiator.
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