What is a circular saw primarily used for?

A circular saw is primarily designed to make straight cuts in wood and other materials. This type of saw utilizes a toothed or abrasive disc or blade that rotates around an arbor, allowing it to cut efficiently through various types of wood. Its design makes it ideal for both crosscuts and rip cuts, enabling carpenters and woodworkers to produce clean, precise cuts quickly.

While the other functions listed are important aspects of carpentry, they are not the primary purpose of a circular saw. Drilling holes in wood is typically done with a drill, sanding surfaces is accomplished using sanders or abrasive materials, and joining pieces of wood together is achieved with techniques such as nailing, gluing, or using screws. Thus, the circular saw stands out for its specific function of making straight cuts, making option B the correct choice.