Answer: A. Cause: The men become aware that they are following their own footsteps. Effect: They lose faith in Ollendorff as a guide.
Explanation:
This is based on the books "Roughing it" by Mark Twain. It is partly based on the early life of Mark Twain as a young journalist and gold miner. In one journey through the snow, the characters in the book are following a man named Ollendorff who claims to be good at directions.
The men began to see snow tracks and theorized that there was a large group of people in front of them that kept getting larger because the tracks seemed to increase. This confused them until they figured out that it was actually their tracks and that they can been going around in circles. This caused them to lose faith in Ollendorff.