What is a burin primarily used for in the context of art?

A burin is a specialized tool primarily used for engraving detailed designs into hard surfaces, such as metal, wood, or glass. Its sharp, pointed end allows artists to make fine lines and intricate details in their work, making it an essential tool in the field of printmaking and engraving. The precise control it provides is crucial for artists who need to produce delicate and refined designs, which is why option B is the correct answer.

The other options, while related to various art forms, do not accurately represent the primary use of a burin. Tools for cutting ceramic pieces or molding metal sculptures would differ in design and function, and spinning wood into shapes typically requires different equipment altogether, such as lathes and chisels. Therefore, understanding the specific purpose of a burin clarifies its importance and role in artistic practices related to engraving.