Which type of box is specifically designed to support lighting fixtures?

A ceiling box is specifically designed to support lighting fixtures, making it the appropriate choice in this context. Ceiling boxes are constructed to bear the weight of light fixtures as they are mounted directly to the ceiling framing. These boxes often come with brackets or additional support features to ensure they are securely attached, providing the stability required for ceiling-mounted lighting.

Junction boxes serve a different purpose; they are used to contain wire splices and are not meant to support the weight of lighting fixtures. Underground boxes are designed for outdoor electrical installations, typically for wire connections buried below ground, and are not suitable for lighting support. Raceway boxes, on the other hand, are intended for running and organizing electrical conductors within a raceway system and do not serve to support fixtures. Therefore, the ceiling box stands out as the correct answer due to its specific design and intended use for supporting lighting fixtures.