What should you do if, while driving, your vehicle cannot reach the required minimum speed and there is a risk of being rear-ended?

What should you do if, while driving, your vehicle cannot reach the required minimum speed and there is a risk of being rear-ended?
A)Press the brake intermittently to warn with the brake lights that you are going to slow down.
B)Flash the high-beam headlights.
C)Use the hazard warning signal.Correct
When a vehicle cannot reach the required minimum speed and there is a risk of being rear-ended, the direction indicator lights must be used as a hazard signal while driving. Any driver who, due to an emergency, is forced to travel on a motorway or dual carriageway at an abnormally reduced speed must leave it at the first exit.