Final Answer:
The statement given "Hot-rolled steel has a thin copper layer which is formed during the rolling process." is false because hot-rolled steel does not have a thin copper layer formed during the rolling process. Option B is the answer.
Step-by-step explanation:
Hot-rolled steel undergoes a rolling process at high temperatures, shaping it into various forms. While this process can create scale (iron oxide) on the surface due to oxidation during heating, it does not result in the formation of a thin copper layer.
Copper is not inherently part of the hot-rolling process for steel. The presence of copper on steel surfaces is usually intentional and achieved through additional processes, such as electroplating or cladding, for specific applications where copper's properties are desirable.
Option B is the answer.