Answer:
D- both A and C
Explanation:
- Being told your financing fell through
It's usually used to trick you to pay with cash. The scammers will position themselves as a 'helper' that can get you the car despite the fail financing. If your dealer told you this,it could be a red flag there's a chance that he/she might ran away with the money without giving you the car.
- Lengthy negotiations
This is not a red flags. Both the sellers and the customers will always try to get the best deal possible. So often times, the negotiations will become lengthy until they eventually found a middle ground.
- charging excessive fees
In order to be aware of this, you need to conduct individual researches so you have general idea regarding the market value of the car along with average prices for additional services.