Final answer:
When being passed on the right by many vehicles, the correct action is to safely move to the right to allow faster traffic to pass and maintain the flow of traffic.
Step-by-step explanation:
If you are being passed on the right by many vehicles, the most appropriate and safe action to take is a) Move to the right. This is typically an indication that you may be driving too slowly in the passing lane, and it is generally safer and courteous to move over to the right to allow faster traffic to pass. It's essential to adhere to the basic rules of the road to maintain traffic flow and enhance road safety. Speeding up, moving to the left, or honking your horn are not appropriate actions in this scenario as they can lead to dangerous driving conditions or road rage incidents.