The thermostat sticking in the "open" position leads to the premature deterioration of the engine, because it keeps the operating temperature too low. In this situation, the coolant circulates continuously through the radiator, preventing the engine from reaching the optimal temperature. This affects the combustion of the fuel, increases consumption and favours the deposits of residues inside the engine. Also, lubrication is compromised, because the oil does not reach the viscosity necessary for the protection of the components.
The correct answer is: C
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