The correct answer is: B. Grey or foundry pig
Pig iron made from haematite ores free from sulphur, phosphorus and copper is known as grey or foundry pig. It is a type of pig iron that is used in the production of cast iron. It is a hard and brittle material that is not suitable for use in the production of steel.
Bessemer pig is a type of pig iron that is made from haematite ores that contain sulphur, phosphorus and copper. It is a soft and ductile material that is suitable for use in the production of steel.
White or forge pig is a type of pig iron that is made from haematite ores that contain sulphur and phosphorus. It is a hard and brittle material that is not suitable for use in the production of cast iron or steel.
Mottled pig is a type of pig iron that is made from a mixture of haematite and magnetite ores. It is a hard and brittle material that is not suitable for use in the production of cast iron or steel.