Which type of wire is often used in residential wiring applications?

In residential wiring applications, the use of non-metallic (NM) wire and THWN wire is common due to their specific properties that make them suitable for such environments. Non-metallic (NM) cable is widely used in residential settings because it is lightweight, easy to install, and provides excellent insulation. It is typically used for indoor wiring, where protection from moisture is not a significant concern.

THWN (Thermoplastic Heat and Water-resistant Nylon-coated) wire is also relevant in residential applications, particularly in areas where moisture resistance is essential. This type of wire is often used for conductors in both indoor and outdoor applications, as it resists water, chemicals, and heat.

By choosing option D, it acknowledges that both NM and THWN wiring are appropriate for residential use, which offers flexibility in various installation scenarios depending on the specific needs of the project.