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Imagine that you are checking an engine's cooling system. When you check the coolant level, you find that the level is very low. After performing a complete visual examination of the cooling system, you can't see any leaks. You then perform a pressure test on the cooling system, but still cannot locate any external coolant leaks. You examine a sample of oil from the engine, but the oil does not appear to be contaminated. Next, you remove the spark plugs from the engine and examine them. One spark plug appears to be extremely clean. Which of the following is the probable cause of the low coolant level?
a) Coolant is leaking into the combustion chamber. b) The water pump seal has failed.
c) Coolant is leaking into the lubrication system. d) A radiator hose has ruptured.

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