What is the proper equipment required to check and adjust brakes?
Answer: D — All of the above
The other options, A, B, and C, may be handy tools to have when checking and adjusting brakes, but they are not the only necessary equipment. Option D, "All of the above," is the most appropriate answer as it includes all the necessary equipment mentioned in the other options. A wrench and a flashlight are useful for examining the brakes, a marker can be used to measure push rod travel, and sturdy clothing is necessary for crawling under the vehicle to access the brakes. Therefore, option D is the most accurate and comprehensive choice.