The（）steels are hardest, strongest, and yet least ductile of the carbon steels， and wear resistant and capable of holding a sharp cutting edge.

The（）steels are hardest, strongest, and yet least ductile of the carbon steels， and wear resistant and capable of holding a sharp cutting edge.
A.low-carbon
B.medium-Carbon
C.high-carbon
D.mild
正确答案：high-carbon