Final answer:
Option (B), Marcel Grateau was the first person to introduce thermal irons, which led to the invention of the curling iron and revolutionized hairstyling techniques.
Step-by-step explanation:
The first person to introduce thermal irons was Marcel Grateau. In the late 19th century, Marcel Grateau developed the technique of using heated rods to create waves and curls in the hair, leading to the invention of the curling iron. His innovation greatly influenced hairstyling techniques and the evolution of hairdressing tools. The use of thermal irons revolutionized how hair could be styled, paving the way for various hairstyling tools that utilize heat for hair shaping and styling today.