The correct answer is: D. ethyl alcohol and H2O.
Ethyl alcohol (ethanol) is a common substance used as an antifreeze in radiators of automobiles. It is a colorless, flammable liquid that is miscible with water. Ethyl alcohol has a lower freezing point than water, which means that it will not freeze as easily. This makes it an effective antifreeze, as it helps to prevent the radiator from freezing and cracking in cold weather.
Methyl alcohol (methanol) is another substance that is sometimes used as an antifreeze. However, methanol is not as effective as ethyl alcohol, and it is also more toxic. Methanol can be absorbed through the skin, and it can cause blindness or death if ingested. For these reasons, ethyl alcohol is the preferred antifreeze for automobiles.
Water is also an important component of antifreeze. Water helps to cool the engine by absorbing heat. It also helps to prevent the formation of rust and corrosion.
When choosing an antifreeze, it is important to select one that is compatible with the type of radiator in your car. You should also check the manufacturer’s recommendations for the type and amount of antifreeze to use.