Answer:
Cluster Sampling
Explanation:
According to my research on the various sampling methods, I can say that based on the information provided within the question the type of sampling being used is called Cluster Sampling. This is a method in which the researcher chooses different groups (referred to as clusters) and then samples/surveys individuals within each group. Which in this case the 80 dealerships would be considered the Clusters and the individuals visiting each dealership are sampled.
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