My choice isn't there. How about all three?
I grew up in Utah, and when there, I would walk to school when it wasn't snowing, and be a car rider when it was. About half the time once I got in Jr High, my mom or another car pool driver took us in.
When we moved to Texas, I became a bus rider most of the time. I lived way too far to safely walk (or, more accurately, there were two major streets to cross without a light, so it was deemed safer to drive/bus than to walk). Occasionally, one of my parents would drive me in or give me a ride home.
So, I've done all three.