Answer:
peripheral route
Step-by-step explanation:
In the peripheral route of persuasion the argument is agreed upon because of cues that are not the merits of the argument itself but other factors.
Here, Sam was persuaded by a beautiful saleswoman that he would lool good driving a flashy car. The argument is not based on facts but is presented in such a way that persuades Sam to buy the flashy car.
Hence, Sam is using the peripheral route.