The correct answer is A. 1.5% to 5.5%.
Cast iron is a type of iron alloy that contains carbon in a range of 2.11% to 6.67% by weight. The carbon content of cast iron is higher than that of steel, which typically contains 0.02% to 2.11% carbon. The higher carbon content of cast iron makes it more brittle than steel, but also more resistant to wear and tear. Cast iron is used in a variety of applications, including engine blocks, cylinder heads, and cookware.
Option B is incorrect because the carbon content of cast iron is not typically between 0.05% and 1.75%. Option C is incorrect because the carbon content of cast iron is not typically 0.250%. Option D is incorrect because the carbon content of cast iron is typically between 1.5% and 5.5%.