When is it allowed to state "one-owner" in a vehicle advertisement?

Answer: A — When the vehicle has only had one prior owner

It is correct to state "one-owner" in a vehicle advertisement when the vehicle has only had one prior owner. This indicates that the vehicle has not changed ownership multiple times and the current owner is the first and only owner. Stating "one-owner" is not applicable for a new vehicle, as it has never had a previous owner. It is also not applicable for a vehicle that has never been sold before, as it has not had a prior owner. Additionally, a warranty does not necessarily mean that the vehicle has only had one prior owner, so this option is also incorrect.