Final answer:
The correct option is B. To check the operation of brake lights, a technician would generally require the assistance of a helper to press the brake pedal while observing the lights from the rear of the vehicle.
Step-by-step explanation:
When checking the operation of brake lights on the rear of a vehicle, a technician might need the assistance of a helper. The reason for this is that brake lights are activated when the brake pedal is depressed, which is typically inside the vehicle, while the lights themselves are on the outside.
By having a helper press the brake pedal, the technician can stand behind the car and observe whether the brake lights illuminate properly without the need for any complex equipment. A visual inspection will help ensure that the brake lights function when the brakes are applied, which is crucial for safety on the road. It's possible that a computer might be used in more advanced diagnostic scenarios, but for a simple check, a helper is sufficient.