Please answer the following question: Here's a short story: Carter is riding his bike and wants to go fast. First he rides his bike on the grass in his yard, then he rides it in the street. Carter sees that his bike goes a lot faster when he's riding on the street. This is because the street is (A) rougher than the grass. (B) smoother than the grass. What is the most sensical answer between "street" and "grass"?
A:
grass