Which one of the following statements shows the correct percentage of carbon in steel,pig iron and wrought iron?

• A
  Steel containing less than $0.15\%$ carbon; wrought iron $0.15$ to $2.0\%$ carbon; and pig iron over $2\%$ carbon
• B
  Pig iron less than $0.15\%$ carbon; wrought iron $0.15$ to $2.0\%$ carbon; and steel over $2\%$ carbon
• C
  Wrought iron less than $0.15\%$ carbon; steel $0.15$ to $2.0\%$ carbon; and pig iron over $2\%$ carbon
• D
  Wrought iron less than $0.15\%$ carbon; pig iron $0.15$ to $2.0\%$ carbon; and steel over $2.0\%$ carbon