Which statement about general-purpose circuits is true?

General-purpose circuits are indeed a fundamental aspect of home wiring systems and generally make up the largest part of these systems. They are designed to supply electricity to a wide range of household devices and fixtures, such as outlets in living rooms, bedrooms, and hallways, rather than being restricted to just a few specific uses. The versatility of general-purpose circuits allows them to service various appliances and devices throughout the home, which contributes to their prominence in residential wiring.

This broad application is why they are crucial for creating a functional and comfortable living environment, as opposed to being limited in scope or quantity, as suggested by the other options in the question. Options suggesting they are the least used, limited to kitchen circuits, or only utilized for lighting do not accurately reflect the extensive role general-purpose circuits play in typical home electrical systems.