Read the following context and choose the best option to answer the question.
Context: I continued to hear it running . I followed the footprints left in the freshly fallen snow . My soldier had pushed the snowblower around into the back yard and down the full length of the yard to the back corner of the fence . There he had lifted the sizable machine over the top of the fence and onto the wetland behind it .
Question: How did the narrator find the person ?
Options: 
- Physically tracking them .
 - None of the above choices .
 - Through Wetland guides .
 - Through a tracker knowledgeable of the Wetlands .


Physically tracking them .