which of the following installations could use an underground duct system? indoor fire alarm system…

Brief Explanations:

Underground duct systems are often used for electrical wiring in areas where protection and organization of cables are needed. Warehouse receptacle circuits may require a large - scale and protected wiring system, and an underground duct system can provide protection from physical damage, moisture, and other environmental factors. Indoor fire alarm systems usually have their own specific wiring methods that are often routed through walls and ceilings in a more direct way for quick response. Office lighting systems are typically installed within the building's walls and ceilings. A large transformer vault has specific safety and ventilation requirements and is not typically associated with underground duct systems for its main functionality.

Answer:

B. warehouse receptacle circuits