What does an octagonal box typically house?

An octagonal box is specifically designed for electrical connections related to light fixtures. This type of electrical box is commonly used in residential settings because its shape allows for the proper mounting of ceiling lights, wall sconces, or other lighting fixtures. The design accommodates multiple conduit entries, making it easier to manage the wiring that connects to light fixtures.

In contrast, while electrical meters, wiring harnesses, and electrical panels serve important functions within an electrical system, they are not housed in octagonal boxes. Electrical meters are typically mounted on a separate enclosure outside or inside a home that provides access for utility workers. Wiring harnesses, which bundle multiple wires in an organized fashion, aren't contained within boxes at all but rather used in conjunction with equipment or appliances. Electrical panels, which distribute power throughout a building, are housed in square or rectangular boxes, not octagonal. Thus, the octagonal box’s primary purpose revolves around safely housing electrical connections for light fixtures, confirming that option B is the correct choice.