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. Ethanol has a lower freezing point than water, so it helps to keep the radiator fluid from freezing in cold weather. It also has a higher boiling point than water, so it helps to keep the radiator fluid from boiling in hot weather.
Methyl alcohol (methanol) is another substance that is sometimes used as an antifreeze. However, methanol is toxic and can be fatal if ingested. It is also more flammable than ethanol. For these reasons, ethanol is the preferred antifreeze for most applications.
Water is also a common substance used in antifreeze. It is a colorless, odorless, tasteless liquid that is essential for life. Water has a high boiling point and a high heat capacity, which makes it ideal for use in antifreeze. It also helps to lubricate the engine and prevent corrosion.
The combination of ethanol and water is the most effective antifreeze for most applications. Ethanol lowers the freezing point of the mixture, while water raises the boiling
point. This helps to keep the radiator fluid from freezing in cold weather and boiling in hot weather. The mixture is also non-toxic and non-flammable.