Final answer:
Cast iron has a carbon content between 2% and 4%, which is significantly higher than that of mild steel, wrought iron, or aluminum.
Step-by-step explanation:
The metal that has a carbon content between 2% and 4% is d. Cast iron. Mild steel typically contains up to about 0.25% of carbon, which is much less than the 2%-4% range. Wrought iron has high purity iron with negligible carbon content, and high carbon steel has up to 1.5% carbon. Aluminum is not an iron-carbon alloy and therefore does not fit this category.