How Do They Know This Stuff?

I got a call this morning from my credit card company checking to make sure some recent purchases weren't fraudulent. Actually it was only two purchases, each less than $35.00. I appreciate them checking but I wonder what caused the red flag? Walmart?

So anyway, they asked me some security questions to make sure it was really me. One was how tall does my drivers license say I am and the other was what color was my old Firebird that I sold? They must have gotten this information from the government because I sure don't remember ever giving it to them, I sure didn't tell them I sold it. If you know where to look, the information is out there. And apparently, they are looking.