What is one of the key components of a vehicle's buyer's guide according to FTC guidelines?

Answer: A — clear statement about warranty coverage

The key component of a vehicle's buyer's guide according to FTC guidelines is a clear statement about warranty coverage. This information is crucial for consumers as it outlines what protections they have regarding repairs and replacements after purchasing a vehicle. The warranty coverage details help buyers understand their rights, what components are covered, and for how long, enabling them to make informed decisions. The other options, while relevant to the buying process, do not carry the same weight in terms of federal regulatory requirements. The average market price provides useful context for the transaction but does not ensure consumer protection regarding vehicle condition and future costs. The dealer's license number is important for legitimacy and accountability but is not directly connected to the consumer's immediate rights or protections. Lastly, details on how to register the vehicle are practical but fall outside of the written disclosures mandated by the buyer's guide.