Where could you find a pebble that has been walked on?\nOptions:\n- lake\n- playground\n- pond\n- aquarium\n- stucco Let's think step by step:
User
Playgrounds have small pebbles. Kids walk and play on the pebbles in the playground. One can find a find a pebble that has been walked on, in a playground. So, the answer is playground.
Assistant