Which type of circuit must be used for temporary lighting according to the NEC?

The requirement that a circuit for temporary lighting must be protected and properly grounded stems from the National Electrical Code (NEC) guidelines, which emphasize safety and reliability in electrical installations. Temporary lighting often occurs in situations where conditions may be less stable, such as construction sites or events, making it critical for the circuit to have adequate protection against electrical faults and to minimize risks associated with electrical shock.

Proper grounding ensures that any electrical faults are safely directed to the ground, reducing the likelihood of equipment damage and enhancing user safety. A circuit that lacks proper grounding or protection increases the risk of electrical hazards, which is why compliance with NEC requirements is essential for any temporary installation. This consideration makes option B the most appropriate and compliant choice regarding safety in temporary lighting applications.