Which set of building terms do NOT belong together?

The correct response indicates that "cripple trimmer" and "purlin" do not belong together, as they refer to different components in construction. A cripple trimmer is a type of framing member used in roof constructions, often associated with supporting the ends of rafters, whereas a purlin is a horizontal member that provides support to the roof sheathing or is used to distribute the load from the roof structure. Their functions and placements within the construction system differ significantly, which sets them apart as a mismatched pair.

In contrast, the other combinations present terms that are closely related in their functions and associations. The terms "arch," "header," and "lintel" all refer to structural components that provide support over openings in walls, such as doors and windows. Similarly, "rafters," "ceiling joists," and "trusses" are all parts of the roof structure, designed to provide support and shape to the roofing system. Lastly, "sheathing," "flooring," and "decking" pertain to various types of surfaces that cover structural components in buildings, illustrating their roles within the overall structural envelope. Each of these terms in the other selections shares a thematic connection, reinforcing their proper grouping, unlike the