This answer is unsupported. We don’t know anything about who made the early wheeled vehicles or the ceramic models.

This answer is unsupported. We don’t know if few models were wooden. We only know archaeologists found ceramic models. It is possible that many models were made from wood, and just disintegrated. We can't assume something about all models based only on the models archaeologists found.

This answer is unsupported. We don’t know from the stimulus whether or not the makers of early wheeled vehicles were aware of preservation methods.

This answer is unsupported. We don’t know from the stimulus which artifacts are more difficult to find. We can't assume that waterlogged or dessicated wooden vehicles exist but weren't found—we just don't know one way or the other.

This answer is strongly supported. The stimulus says that the reason archaeologists haven't found many vehicles is because wood disintegrates over time. The only way that makes sense is if more early wheeled vehicles were made from wood than from materials like ceramic.