When parking facing downhill, what is the correct procedure?

Answer: A — Park within 15cm of the curb and turn front wheels into the curb

When parking facing downhill, the correct procedure includes parking as close as possible to the curb, ideally within 15 cm, and turning the front wheels into the curb. This technique is vital for preventing the vehicle from rolling away if the brakes fail. By turning the wheels toward the curb, if the vehicle were to move, it would roll directly into the curb, reducing the risk of accidents or obstacles in the roadway. This method focuses on ensuring safety and control when parking on a slope. Other options do not provide adequate safety measures for securing the vehicle on a downhill slope. For example, simply parking within a certain distance from the curb without turning the wheels does not offer any protection against potential rolling. It is also important to note that parking facing uphill is not relevant in the context of this question, as the scenario specifically addresses downhill parking.