1) Websites like this rarely have control over which specific ads show up on the site. They offer an ad slot, it's automatically bid on by advertisers, and the best ad wins.
2) That bidding isn't just over the ad slot — it's over your specific eyeballs. Likely you've recently spent time on an automotive-related website or searched for something about insurance or any number of myriad related topics that would push you to the top of AAA's "I want to advertise insurance to them" list.