Which of the following are checked to ensure lights are clean and working properly?
Answer: C — Reflectors, Marker Lights, Clearance Light, Tail Lights
The incorrect options are not fully comprehensive and do not include all the necessary lights that should be checked. Option A is missing the reflectors and option B is missing the tail lights. Option D has a combination of lights that are not necessary for this specific check. Therefore, C is the most comprehensive and accurate answer.