Florida Learner's Permit Practice Test

Before draining the radiator fluid from a vehicle, it is important to disconnect the negative battery cable to avoid any potential electrical mishaps. While B, C, and D may also be necessary steps when draining the radiator fluid, A is the most important as it ensures safety during the process. B, putting on protective gloves, is important for preventing any mess or potential burns from the hot fluid. C, positioning the fluid catch receptacle, is necessary to catch the fluid and prevent it from spilling onto the ground. And D, opening the radiator cap, is part of the actual process of draining the fluid, but should not be done until after the battery cable is disconnected. Therefore, the best answer is A as it is the most crucial step to take before beginning the draining process.