_Ductile cast iron$?

• A. Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
• B. Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
• C. Is produced by annealing process. It is soft, tough and easily machined metal
• D. Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material