This is a question of semantics, not a poll on how many kids can ride a bike, so I put it in TAO. Hope that's okay!
In short, the question is "Can your DC ride a bike?" How would you answer? I realize there are no "no" answers, because it's not a question of whether your kid can ride a bike or not, but rather what the definition of riding a bike is. I guess.
Multiple choice. I'll explain my thinking later ;)
And one more question, what do you think of when thinking "two-wheeler"?