Shredded-styrene insulation is best characterized as which of the following?

Shredded-styrene insulation is best characterized as a white material filling masonry-block wall cavities. This type of insulation is designed to provide thermal resistance and reduce sound transmission in walls, making it effective for use in masonry constructions. It typically has a light color due to the material composition, often appearing white or light gray.

Blown insulation made from treated newspaper describes a different type of insulation, typically cellulose, which doesn't relate to shredded styrene. Fiberglass material used in ceilings refers to a distinct type of insulation with different properties and applications; this choice highlights a standard insulation method but does not encompass the specific nature of shredded-styrene. Dense foam used for thermal insulation points to a solid form of insulation, such as polyurethane foam, which lacks the shredded texture and purpose associated with shredded styrene.

By understanding these distinctions, one can see how shredded-styrene insulation is specifically aligned with the characteristics described in the correct answer.