Which of the following is required at the end of a conduit that terminates underground where the conductors emerge?

The requirement for a bushing or terminal fitting at the end of a conduit that terminates underground is essential due to the function it serves in protecting the conductors as they emerge from the conduit. This protective measure ensures that the conductors do not become damaged from any sharp edges of the conduit or from external environmental factors in the underground setting.

The NEC emphasizes the need for safety and longevity of electrical installations, and using bushings or terminal fittings helps to prevent abrasion of the conductors, which could lead to short circuits or electrical faults. This requirement is particularly important in locations where conductors enter or exit conduits, as these points are vulnerable to wear and tear.

Other options, while potentially useful in various contexts within electrical installations, do not fulfill the specific requirement of providing protective measures at the end of the conduit in this scenario. Support brackets, conduit bodies, and wire connectors serve different roles in installation and maintenance but do not specifically address the protection needed for conductors emerging from underground conduits.