Answer:
They did not know how to navigate.
Step-by-step explanation:
In the context of 'A Desperate Trek Across America,' the Spaniards went on a trip to explore the American culture. During the journey, they were having a hard time to make the trip using a raft as they 'did not know how to navigate it' to move the journey forward.' This leads them to struggle for even their survival for which they have to further shift to new resources in order to survive. Thus, option B is the correct answer.