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