How should you reinforce signals safely?

Answer: C — Use arm signals

Reinforcing signals are an essential aspect of safe driving as they help to communicate with other drivers and indicate your intentions on the road. While options A, B, and D may seem like common means of reinforcing signals, they are actually incorrect and can be unsafe. Honking the horn and revving the engine can be disruptive and alarming to other drivers, and flashing headlights is typically used to signal a warning rather than to reinforce signals. Therefore, using arm signals is the safest and most effective way to reinforce signals while driving. Arm signals are also more visible and can communicate your intentions clearly to other drivers. It is important to always use proper and safe techniques when reinforcing signals on the road to avoid confusion and potential accidents.