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 .

Based on the preceding passage, choose your answer for question How did the narrator find the person ?
Available choices: (1). Physically tracking them .; (2). None of the above choices .; (3). Through Wetland guides .; (4). Through a tracker knowledgeable of the Wetlands .;
The answer is:
(1).