When parallel parking, what should you do first?

Answer: A — Signal your intention

Before parallel parking, the driver's immediate action should be to signal their intention, that is, to communicate to the drivers behind them that they will be parallel parking. Option B and D are incorrect because they both refer to the action of "beginning" or "placing" the vehicle, which should happen after signaling. Option C is incorrect because turning the wheels sharply should happen after the vehicle is properly positioned, which requires signaling and the other actions listed in the answer.