Which of the following metals has a carbon content between 2% and 4%?

Cast iron is a group of iron-carbon alloys that typically contains between 2% and 4% carbon. This carbon content is significant because it contributes to the material's characteristics, such as its ability to cast and machine easily, and its brittleness compared to other iron alloys. The presence of carbon in these quantities helps to lower the melting point of iron, making it easier to form complex shapes in molds. Additionally, the higher carbon content in cast iron contributes to its hardness and wear resistance, making it suitable for various applications, including engine blocks and pipes.

Steel, while also an iron-carbon alloy, generally contains less than 2% carbon, which gives it different properties compared to cast iron. Copper and aluminum are non-ferrous metals, meaning they do not contain significant amounts of iron or carbon, and their properties differ drastically from those of ferrous metals like cast iron.