Please answer the following question: I am testing my students' logic. What is the answer they should choose between "grass" and "dirt"? Logic test: Maria decided to take her child to the park. She put her child in the stroller and went for a walk. Maria realized she was tired of pushing the stroller on grass after a much shorter distance than when she pushed the stroller on dirt. Maria then figured out that she could push the stroller for a longer distance on the dirt paths because there was (A) more friction (B) less friction.
A:
dirt