Which of the following is a building feature of structures with 13R sprinklers?

The choice indicating "taller structures" as a building feature of structures equipped with 13R sprinklers is correct due to the specific design and density of these sprinkler systems. The 13R sprinkler system is tailored for residential occupancy and is designed to protect buildings up to a limited height, typically five stories or less. However, the underlying principle in their design allows for effective fire control in taller residential structures, provided they meet the necessary safety standards.

Taller structures potentially benefit from the installation of 13R sprinklers as they facilitate the fire suppression capabilities needed to manage fires effectively within an enclosed space. This system enhances life safety while minimizing property damage, thus making it optimal for structures that can reach higher elevations, especially in urban environments where space efficiency is crucial.

Other options like shorter hallways, wider doorways, and larger windows do not directly correlate with the distinctive characteristics of 13R sprinkler provisions. These features may vary based on building design standards or aesthetics rather than specifically supporting the functionality and safety provided by 13R systems. Hence, focusing on taller structures highlights the intent behind using this type of sprinkler system in residential fire safety planning.