Final answer:
The provided texts do not offer enough information to determine why Salva and his group stopped walking, as the specific context of Salva's journey is not given.
Step-by-step explanation:
The reason Salva and the group of people stopped walking is not explicitly provided in the passages presented. Each excerpt from the provided text describes different scenarios, often involving characters in challenging situations, but none of them clearly state why Salva and his group ceased their journey.
Therefore, without additional context or information about the specific story or circumstances of Salva's journey, it is not possible to answer this multiple-choice question accurately.