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Ron had his dad's permission to use his car, even though the predicted weather was frigid and a snowstorm was expected. Ron remembered to check the oil and refill the cooling system with water the night before he left. He also positioned the car near the end of the driveway so he could easily get out if the snow started overnight. The next morning, the car started fine, but steam began to come from under the hood after he had driven for a while. What is the most likely cause of this?

A He forgot to add antifreeze, as well as water, to the cooling system.
Antifreeze lowers the freezing point of water to prevent it from freezing during cold weather. If the water in the cooling system freezes (as it might in the weather described), the car will start, but the radiator will overheat when no water can reach it because the water is frozen. Steam from under the hood would be a symptom of this. The car would not have started at all if the battery was dead. Oil issues would not cause steam and any amount of oil would not have been used in a short time. The engine may be old, but steam, by itself, is not an indication of it needing to be replaced.
B The battery was dead.
C He forgot to put the oil cap back on.
D The engine is old and needs to be replaced.