The correct answer is A. 0.1 to 1.5.
The percentage of carbon in steel ranges from 0.1 to 1.5%. This is because carbon is the main alloying element in steel, and it has a significant effect on the properties of the steel. The higher
the carbon content, the stronger and harder the steel will be, but it will also be more brittle.Option B is incorrect because the percentage of carbon in steel does not range from 1.5 to 3.0%.
Option C is incorrect because the percentage of carbon in steel does not range from 3.0 to 4.0%.
Option D is incorrect because the percentage of carbon in steel does not range from 4.0 to 6.0%.