A6. Goodyear Tire
But, you can get credit if you said Ford, Chrysler, RCA, RJ Reynolds Tobacco, McDonald's, or Budweiser.
Technically, we don't know exactly what the first Super Bowl ad was, because the only known footage of the game isn't accessible. But we do know some of the featured ads, with the most prominent being the one from Goodyear, which featured a woman alone on the road after her tire blew.