What construction type is exemplified by prefabricated homes that are not mobile?

The correct choice is identified as factory-built homes, which encompasses a broad category of structures that are constructed in a factory setting and then transported to a site for assembly. This type of construction includes various methods such as modular and panelized systems, but factory-built homes specifically refer to units that have been entirely constructed in a controlled environment before being moved to the final location.

In the context of the other options, modular homes are indeed a subtype of factory-built homes that are constructed in sections (modules) and then assembled on-site. Panelized homes also fall under the factory-built category but are a specific construction method that uses panels for walls and roofs. Manufactured (mobile) homes, on the other hand, are built to different standards and are typically designed for mobility, which distinguishes them from the non-mobile prefabricated homes referred to in the question.

Understanding this categorization helps clarify why factory-built homes is the appropriate answer, as it is the most inclusive term that accurately describes the nature of these non-mobile prefabricated structures.